Boyfriend took another girl to dinner...?

A few nights ago my boyfriend told me that a friend was high school was coming out and that they were going to go for dinner & beers together to talk about college and job related stuff because he is trying to get into law school. The girl drove about 40 minutes to our city. He told me he'd be back for an hour and a half, and it took a lot longer and we had to miss our plans for a movie we were going to see that night. When he got back to his place he apparently fell asleep and I didn't hear from him for 7 hours since he left for the dinner.
I then found out that he paid for the girl's dinner and I got SO mad and we started fighting. He doesn't seem to think there is anything wrong with what he did and I can't convince him otherwise. Who is right here?? It seems like a legitimate request to me to ask that my boyfriend doesn't take other girls out to dinner! Any input would be greatly appreciated, thank you!
He assures me that he wasn't trying to impress her or anything by paying for her, he just felt bad for her driving so long, but that's not his problem. It must have been pretty expensive too if they were drinking....

umm did you ask to go along if he you did and he gave you a problem about it i wouldnt take it to lightly and keeep ur eye out

Firstly...you should trust your boyfriend (otherwise why are yous together?)but on the other hand i can see your point. i would say give him the benift of the dought (they could just be old friends and he payed as they havent seen each other in a long time, i have a friend who is like that with me)
Secondly their is no point in arguing over somthing that is happend just make sure he knows how you feel but dont let it tear your realtionship apart, if it happens agen then be sure to ask more questions but for now i woudnt look to it to it, at the end of the day hes with you not her.
hope this helps. x

he slept with her and he is lying to u

Ok these people are retarded.
1 your boyfriend needs to have friends. I have plenty of guy friends from highschool that I'd love to catch up with and see how they are doing.
I just moved in with my boyfriend and we have a great relationship we don't cheat and we are honest with each other. I have guy friends and when we go out to lunch or do dinner (which we sometimes do) they usually pay for me (knowing I have a boyfriend) it is just the gentleman thing to do. Even guys that are friends with my boyfriend will do that sort of thing. My friends are all guys and I have never cheated on anyone in my life. There is a chance he didn't tell you because he knew you would get mad he was hanging out with another girl. this could mean he was going to cheat or simply mean he wanted to see his friend he hadn't seen in a while and just relax. Either you trust him or you don't . Maybe he just feels smothered.