I was having this issue for a min. Lemme tell you: don’t get egotistical. I thought it was all about me and something I was doing wrong or maybe he was wasn’t interested anymore, but it’s most likely that he has something weighing on his mind. Men can be solitary like that, they try to hide it all, so just give him the support you would if you heard him directly say “I’m struggling.” He probably is but doesn’t know how to say that.