Gosh, it sounds like you've copped all the responsibility in this marriage, Gina27! So you stay home & look after the kids & do the work around the place while he goes out 7 nights a week? Hmmm, that doesn't sound quite fair, does it? And, as if that isn't enough, he appears to be involved at least one other woman? ... AND "doesn't want to talk about it" with you?
To put it politely, your partner doesn't appear to have any sense of how a fair partnership works. This is not a great deal for you (or your kids, for that matter) at all. I'd have a good hard think about my situation if I were you. Do you want to keep living like this?