Please help!!! How to not let a girl get to me?!?

[Charlotte]

Ok so last homecoming I had a bad experience by boyfriend of 18 months broke up with me 3 1/2 weeks before and took another girl the whole time during that 3 weeks before the actually dance when we were split we still talked and did everything as if we were dating. Well anyway a week after the dance he dumped the girl
To the curb and we started to date again. But this girl now hates him and me she makes rumors about me and him and she is overly sweet to him and flirts with him. They have to ride together for group assignments all the time and she always posts it on twitter but she is like that with every guy she is a huge flirt and everything even though she has a long distance boyfriend. How do I not let her bother me because she is all me
And my boyfriend fight about because I feel still upset about the homecoming thing but I feel like all of a sudden she is so much prettier and better than me even though I'm
Told all the time by many people I am so much prettier please help !

[Chill your beans]

Well if you are going to rate your self worth by whether a loser like him prefers you to some skank like her then you are a lost cause
Why the heck did you
a) Carry on with him like he had never dumped you after he dumped you for her,
b) get back with him after he got bored with her.
If you are going to let guys use you as an option, you will never feel good about yourself. If you don't treat yourself with respect, no one else ever will.

[Ann]

You are jealous. It is understandable with all this information.

[Ben]

Get rid of him, he's taken liberties with you and your emotions.

Don't be his silver medal. Go and find yourself someone who wants to be with you all the time and not just when it's convenient.

[dina]

I know for advice you wouldn't want someone else telling you their story,but in my case I have to,so that I state my point of view.
I met the perfect guy,absolute love at first sight.Total attachment.A month later he broke up with me.NO REASON STATED.We kept seeing each other since we belong to the same group of friends,A month and a half later he told me he loves..Two..Me and another girl.I was so happy that he loved me that at the moment I was satisfied with anything I got,But just imagine how hurt I was that he was in a relationship with his ex and me..his ex of 2 years..I didn't just feel she's prettier,I felt like she knew him better,she knows how to keep him with her,she makes him happy,he can't stand living without her.And lots of more things that tortured me,things that should be only for me..
Lots of fights were up,until he finally chose me over her.HE NEVER GAINED MY FULL TRUST.I NEVER BELIEVED HE LOVE ME OR HE WON'T CHOOSE SOMEONE ELSE OVER ME AGAIN.
But then his actions started showing..I met his parents right away,like he was really proud to introduce me,he bared with me a 3 months long distance relationship where we used to viber for 8 hours non stop some days !(when I say long distance i mean 12 hours by plane..) He came over for a single minute to my house just to say I love you and leave,when we were with his friends he said "Guys,if you ever lost me,I'll be in a whole different world with her.." and and and..Things started to show up infront of me,he does really love me and only me,and she really means nothing to him..Trust me I'm not a person who trusts easily,I gave him alot of hard time and a feeling that I'm always doubtful about his every single move,until i believed him finally.Besides the girl kept saying stuff like he doesn't love me and he still loves her and he once told her they were "forever" and and and..She tried committing suicide to gain his sympathy..Made him think that I asked some kids to bully her at her new school (!!)
Moral is words don't matter,actions do..His behavior can tell you if he's affected or attracted to her or not..
This girl is obviously jealous of you,can't you see? It took me a long time to realize that,don't do the same mistake,she's not doing all this because she's better and she can get him back,she's doing all this flirting because she's not even close to be compared to you,she needs to make efforts to get someone to notice her,hence the flirting and the tweets !
I have no idea why you're boyfriend did this on homecoming,maybe me for a second he felt like she was better,but then he woke up and realized you are !
Well I won't say be with someone who realized your worth until trying someone worse,but everyone deserves a second chance,he was wrong,who am I to judge?
First of all talk to your boyfriend,and give him a chance to control the situation and stop her,give it like a week or two if you can,if he couldn't then it's your turn to act,talk her,blurt out tell her what she's doing isn't acceptable and just let it all out,she's a sl*t she won't even be offended ! Your boyfriend might not want you to talk her to avoid trouble,that's why i asked you to let him try and control things.
Other than that,don't let her get into you.Think about it,he got with her,even took her to homecoming,and HE STILL COULDN'T stand being with her ! wow she must be amazing..
You and your boyfriend spent ages,i think he probably needed some space,a refreshing phase back then and he found to stupid bit*h to do the job..But you're the girl he goes back to,you're the real lasting deal..
Act in confidence,don't give her the satisfaction to getting into your self esteem ! That's exactly what she wants more than your boyfriend,don't give her that ! She wants to make you jealous so that you fight with your boyfriend to a level where he can't stand and you break up !
Stop giving her these satisfactions!
Raise your head up,fix your crown and walk aside your king,don't let the sheep lead..