He sees his friends more than he sees me. I have NO problem with that.
They go out, sometimes to pubs, other times they just play videogames or eat out. That's great. I do the same but to a smaller scale (still have lots of studying to do). He doesn't mind it either, he actually encourages me to do so more often.
When would that make me mad? When he'd prefer seeing them durig the weekend. We usually see eachother during the week end, so I'd be really pissed off to have to change my plans just so that he can see them more.
How much of going out would make me mad? It depends. He's not addicted to going out, there were weeks when he didn't want to see no one but me (not the whole week, though!!!).
We also have preserved our own set of friends. Meaning that there were several parties where there were girls and for different reasons, I wasn't there. I trust him completely and I don't feel like controling him. But should he go out to several parties during the week (when I can't even think about going out) for several weeks, that would bug me.
But I don't see that happening too soon. He lives 2 hours away from Paris, meaning 4 hours of driving just to see his friends. I'm bad,

, but this little detail plays a major role in our lives. I used to hate it in the beginning, now I got to appreciate it

.