act the way you are
be yourself!
If you're this uncomfortable, it's best you don't hang around or associate with him.
he shouldnt...and if he does then hes not a very good boyfriend.
You act like yourself, because if a guy is with YOU then he likes YOU and should act like YOU. Its okay to act somewhat awkward or nervous around a bf, that's normal.
cause they want to act cool
No matter what, DO NOT act like you miss him.
Just the act of making out should turn him on. Kiss him and caress him.
You will be able to tell by the way the act around one another and how he treats her, talks with her, looks at her. If you wonder maybe you should talk to him about it.
Give her space. Don't be overly obsessive/possessive. If she has any questions, she will ask you. Don't force any pressure on her.
First off, REVENGE IS NOT THE ANSWER!!!!! You should be able to get over it, no matter how long it takes. Not act as bad as he did when he made his mistake.
First of all, don't cheat on your boyfriend. YOu need examine your feelings about your current boyfriend. Do you want to be with him? Do you love him? About this new person, are they real feelings or something just fleeting. Do you want to explore the potential of this relationship? Answer these questions and then act accordingly.
Be yourself, and dont be nervous because hopefully your boyfriend wont care how you act as long as your yourself:)