Problems with Boyfriend

So.... My boyfriend and I live two hours away. I only get to see him during the weekends but since he is in a band and needs to be traveling all the time (or almost all the time) we don't really have sex like we used to. 
For the past 6 months we've only had sex 2 times. And when we do he doesn't finish and I don't finish, his "slug" dies pretty easily, I've asked him if I don't turn him on anymore or what can I do to help him and he says nothing, is there something that I could do? He isn't happy and I am not happy, it makes me wonder if he is cheating or something.. 
Any advice? 

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