Hehe, the first one reminded me of my cousin when he was a teen and started going to the gym, he'd stand in front of the mirror looking at himself and flexing. My aunt hated it, I thought it was amusing. That being said, this was a teenager. This man of yours is I'm assuming in his 30s or 40s? He should honestly be past that stage by now, and it would concern me.

As for the second thing, I agree with above posters that his reaction is totally normal. As for the not responding to texts every time, it wouldn't be a big concern to me unless I had asked a question that needed an answer, and they completely ignored it. Some people are less chatty than others.