Husband had an affair and I believe cheated with other women as well?

Before anyone tells me I'm dumb for trying to make it work, there are children involved that are at an age where a divorce would be hard to understand and hard to deal with. My question is whether or not therapy is a good idea. I don't know if I would prefer couples therapy or if I should just request he get therapy. The situation is complicated since the cheating was several years ago and he only just admitted to it. I believe he has been faithful for 2 years, but was unfaithful before that, and for a few years. He was abused as a child and I believe has some major issues that I didn't see in the beginning. On one side, he's a sweet guy... on the other side he has horrible self esteem (which I think he aided by getting multiple women to show their interest in him), has depression and anger issues. His mother will tell him that nothing happened when he was a child which only makes it worse. (and he's not making up the child abuse, his mother has mental issues which I've witnessed too many times and he has siblings that witnessed the abuse which was directed toward him only, since he was the stepchild) I'm willing to give it a shot, but I think he needs help. Do you think it is a reasonable request for me to tell him we can give it a try if he gets therapy? Also, if anyone else who has been in a cheating situation has any advice that would help... I'll always love him, but I hate him and can't see myself ever trusting him again. We discuss it privately and have never fought in front of the kids before. I would like to continue to handle this quietly, because they are happy children and as far as they know, mom and dad couldn't be happier. I also did not just find out, we discussed it for the first time several months ago, but I find that I'm not satisfied and I feel that the betrayal was much too deep to simply forget about. I find myself angry and hurt out of the blue. I feel stupid for not seeing it and I still check the phone records, emails, etc....Any advice would be appreciated.