boyfriend problem

My bf have been together 8 years and have lived together for the last 2. We are both 25. For the last 6 months we've been fighting nonstop, and he is claiming it's because he has started to want to branch out more on his own, particularly to rock climb more which is his biggest hobby. I have NO problem with him pursuing things he loves and always encourage it. However, the reality of what this looks like is him going to the rock gym after work everyday for several hours, then leaving to go on a climbing trip with his friends every other weekend from Friday to Sunday. The time we do spend together he just wants to sit in front of the tv and "relax." I feel so disconnected from him and that we don't spend any quality time together, but when I bring this up he says he's sorry but it's just what he wants to do. I feel like we are seriously about to end a nearly decade long relationship over this. Thoughts? I'm considering taking up rock climbing just to be more involved in his life but 1. I am not interested in climbing at all and 2. It seems like I'm the only one compromising if I do that just so he'll stay with me, which is not the relationship I thought I'd ever be in.