Sleeping with my husbands....

My husband and I are high school sweethearts. He is my first and only person I’ve ever been with sexually, and honestly over the years our sex life is a bore. He only wants to do one position, no foreplay or anything. He wants me to give him head but is so lazy to do anything to me, not even rub my (you know). And the only position we do is cowgirl which requires me to do all the work. I keep telling him I’m not satisfied and he doesn’t give a shit, he says deal with it or don’t get any at all. Well anyway, he has a really nice looking friend, and I found myself getting attracted to him. I would never cheat though, that’s not my style. I just happen to think of his face when we’re having sex now, and imagining that I’m having sex with him. I also think of him when I’m playing with myself. Do you think this is wrong? I don’t ever intend to act on this.