my bestfriend is dogging me? what do i do about this?

[Alice]

so i have this friend and this is what happend (ill try make it quick)
we had been friends for a while when i took her to meet this guy i had a thing with,
she saw him all over me and told me he was really hot and that we where so cute together,
the next day, she said that she was going to go see him and her other friends because apparantly they are friends... wtf? your MY friend why would you see the guy that IIIII have a thing with? whatever anyways, i kinda was like whatever then the next day the guy and i had a argument and i said we should stop things between us but i obviouusly still liked him, anyway we agreed to be friends in the mean time and he asked me and my friend to come see him and blow me down, the same girl that had seen him before without me was all over him!!! and they hooked up infront of me! the next day we where at school and i asked her why would she do that and he said its not my fault we have a connection. we got into a massive fight and she sent a inappropriate photo of me to him and he posted it on facebook i was devistated my bestfriend and the guy i liked had gone against me!!! wtf, anyway i decided i didnt want to loose my bestfriend but the next day she was having a party and she invited every single one of our friends except for me and then called me up and sent me pictures of her hooking up with the guy and how good her night was :/ i dont know what to do? why would she do this to me? i dont understand im so confusedd? should i pay her back? or what? help ?

[Ali]

Hello my dear.Don,t decide too fast?Don,t pay the pay back with worse!If your friend cares about you and you are interested to him,he makes a good decision and won,t leave you!By showing no reactions to her,she understands how smart you are and keeps her distance from you cleaver good girl!Don,t show you are defeated and raise your head up!That,s all you can do for the time being and let him choose!Be good and be happy.

[polaxed]

"my best friend is dogging me?" do you mean they drive you to a secluded spot and have sex with you, whilst strangers watch?