Whatever you do, don't confront him with what you suspect!
First, you need to be concentrating on you right now.
Second, you only have ONE chance to confront, and you want to do it with a plan, and with as much knowledge as possible. You do NOT want him to know how you know. You do not want your daughter in the middle. Do you want to tell him that she told you about it?
I didn't get to the forums until 2 weeks after my W dropped the bomb, and I confronted my W the first time I found a suspicious email. She denied everything, and them proceeded to completely remove my access to anything. I have a ton of circumstantial evidence, but nothing that proves her affair.
This is hard, but you need to wait on this. Read PuppyDogTails posts about this topic!
Hang in there, take care of yourself!
M:42|W:40|D:17|S:13|Bomb:10/23/09 Awoken's Current Thread