Boy problems, Am i over reacting? Options

[BlackCelicaGT94]

Ok so my boyfriend and I have been dating since mid may...He and I are both on myspace and he usually logged on about once a week where as Im on about 3 times a day. Well yesterday he gets on AIM and tells me to look at his profile cuz his "crazy b*tch ex" wrote him a comment. I look and it doesnt say anything bad...just something like "sup ya jerk bitch. i didn't know you had myspace. i saw chantel come in when i was working at hollister today, how weird is that? i almost stabbed her. with a hanger. no i really don't care, i just thought it was funny. is this natalie chick your gf?"

so thats nothing to really get upset by. Im just upset that she became his friend in the past two days...they dated two years ago and became a sorority coke wh*re. Well now he seems to be loggin on twice a day. and shes really pretty. So im kinda like WTF..why are you logging on twice a day now, why is she ur friend and also her friend is now on ur friend list too, and damn it shes hot and thats makes me go..if u dated her then why are you dating me?!

hes been very genuine and ive had no reasons to not trust him. Not once has a girl called while ive been with him. He spends all his time with his car or with his friend Nick and his girlfriend Ally. He went to a very nice expensive resteraunt on New Years Eve with them...ALONE! haha!

I know im just being insecure but its like Why the hell is she on ur friend list and why is her friend on ur friend list too...keep in mind he only has like 19 friends on there..so hes not like a guy who adds everyone!