HG, I never understand why people in problem relationships handle it one of two ways - get married (like that will solve anything), buy a house (go figure) or have a child (misery loves company).
No matter what else is going on OP is unhappy and needs to get out WITH her child before she's affected by this situation.
I would have been gone when I found out about the husband's "whoses" (not my word). I trust everyone has been tested?