Is He Cheating - "he doesn't embrace me anymore"

My husband travels alot. Most of the time when he is away I cannot reach him and he doesn't call for days at a time.

He's usually quiet, and when he comes home, he's even more quiet and distant. His family noticed this also.

When he returns from a trip, he doesn't embrace me anymore; he kisses me like he would kiss someone he barely knew.

I asked him about all of this and he never explained it to me. My children found pictures on his computer with another woman.

They were in a club and he was holding her and they both had been drinking. She is 20 plus years younger than both of us.

He says there is nothing wrong with it and has not said he's sorry, or that he will not do it again.

I think there's more going on, and I think it's been happening a long time, more than likely w/ other women.

My trust is gone, and I don't know what to do next.I've been loyal to him, and I don't deserve this,nor do our children.I'm attending school.

When I first asked him if anything was wrong with it, he said no, not really.