Confused girlfriend

okay, so Ive been with my bf for 3 years now. 3 years ago when we met I was 16 and he was a bit older than me. So when my mom found out about our age difference and about how we were having sex, she freaked and called the police and placed a restraining order on him and they ended up charging him with sex with a minor. It all came down pretty hard but we are still together trying to get through this. He is currently on 8 yrs of probation. Since his sentence, he has lost almost all of his freedom. He cant see his kids from his previous marriage, he cant be around his younger family members, to put it short hes lost almost everything good in his life. When I turned 18 my mom allowed us to see each other again and date. Here is where I need help: We used to get intimate very often, we love each other and we take care of each other. Hes a good man and I know he would never hurt me. But just a few months ago he started having intimacy issues. He stopped making love to me for a few days, and then weeks, and then months. I bring it up to him alot,and we even fight about it alot and i ask him what is the matter but he says he is just not in the mood. That hes stressed out about the whole probation thing and about having lost his children and basic freedoms. The other thing is that Ive caught him masterbating more than a few times and sometimes its even when Im in the house sleeping early in the morning. I bring it up to him often but I get the same response time after time. Its been almost 5 and a half months with absolutely no sex! We share almost NO intimacy. The closest we even get to that is when we shower together but nothen else. He reassures me he loves me and even apologizes to me for not making love to me. I love him so very much. Can someone please give me an answer that will make sense to me... Do guys usually do this when theyre under alot of stress and possibly depressed? Should I just not care about whether or not he makes love to me and let him do his "man" stuff or what?! Please! Help!