How can I stop letting my ex get to me?

[SheActsLikeSummerAndWalksLikeRain]

My New Years resolution is to stop letting my ex mess with my head, but I'm already struggling with it.
We're high school seniors who were together for over a year.
We broke up 3 months ago.
We have classes together, so we see each other every day.
He completely messes with my head.
Right after we broke up, he was like, "let's get back together."
Then 2 hours later, "we just need to be friends."
He's done that repeatedly.
Then he gave me a Christmas present.
But he also gave some of his chick friends and another ex girlfriend the same thing as me.
He's been going to his other ex girlfriend's house a lot lately.
And one of his chick friends posted on twitter that she was on the phone with him last night, which is a slap in the face to me, because he never wanted to talk on the phone with me.
I'm determined to not let him ruin 2013 for me, but I need help.
So, how on Earth can I stop letting him mess with my head?

[thorntocon]

Build a giant hamster ball and roll around in it.

[Peggy]

Im in grade eight but i sure do know how to give great advice!
find someone new to distract you from him.
Some guys are just jerks. They think they've got their ex on a string. But if the girl is smart enough she cuts the string.
And if i didn't know better, id say he is trying to win you back by making you jealous.
But, again, if you want to get rid of him, tell him to leave you alone. Or you can hang out with your girlfriends and or your other friends.
Or tell someone els to talk to him.
And honey, don't let him get to you. Your not a toy.
Hope it helps! Email me if you need anything els.

[Paul]

Make it your goal to find someone new.

[Cammy]

Sounds to me like he confused and a player. he likes female attention. the fact he gave you a present the same as everyone else, indicates you are not special. You are the same as them. Temporary fun.

This is a battle within yourself and you have to make the necessary changes within yourself to not allow him to bother you.

Maybe you should talk to some guys. Also do not give him another second of your attention even if you like him. Yu have to fight it. Do not speak unless spoken to (and even then be nonchalant about it), do not smile ever even if he smiles. Do not answer his calls and if you do, say you are busy and need to call him back. Then never call. Do not post on his facebook twitter or whatever else, do not even acknowledge or like his comments, posts or statuses. Cut him off completely like a disease.

For one, you will move on, for two he might just come chasing.

A study confrimed that males enoy the chase.