Birthdays and exes...

Ok so I'm invited to my friend's 40th birthday party friday after next. I really want to see her and my other friends who i haven't seen in forever but am nervous because I think my ex fiance and his new girlfriend will be there... In a way i want to invite a guy to show that I've moved on as well... but why should i??? I don't NEED a man to complete me or to make me happy. I've asked a couple of girlfriends to come with me so that I'm not going alone. I figured I would visit with the birthday girl and hang out for a bit and then leave... I don't know why I'm nervous. I guess I just don't want any drama. I'm sure my ex will want to come talk to me but I don't really have anything to say to him anymore. I won't be rude of course but I'll be short with him that is if he even shows up. I don't know why I'm so anxious I just am I guess.. I'm completely over him and am finally loving my life. It's been almost a year since we broke up and I'm happy he's moved on. I just miss his son alot and wonder what is going on with him. I just hope him and his girlfriend are happy. And I don't want to say that I don't want to go because he'll be there. I'm just at a loss I guess. I'm unsure of what to do. So we shall see what happens!