This is so creepy... WAHS Choir Teacher accused of sexually abusing three students (www.adn.com)

I went to elementary school with this guys wife and was good friends with her back then. Granted I haven't talked to her in many years other than occasional quick comments/notes on facebook, but still...

How does this sort of thing happen? His wife seemed (to an outsider) so happy and in love with him. He did really sweet things for her all the time. They had their first baby just before Thanksgiving. Meanwhile, he's fooling around with high schoolers! While they were married, before she was pregnant, and while she was pregnant.

It makes no sense to me at all

a) why someone would cheat on a spouse, especially so early on in a marriage and while moving the relationship forward (buying a house, having a baby). I know people cheat all the time, but it is still hard for me to comprehend.

b) why someone would have a sexual relationship with a minor knowing full well that it could lead to serious jail time and will have huge repercussions on all aspects of life. I don't understand how a 15 year old or 17 year old could be attractive to a 29 year old. yuck.

c) why a teacher would have a sexual relationship with his student. It will only ruin his career fore the rest of his life...

This whole situation has me really disturbed, especially since I know his poor wife.