My husband is always accusing me of cheating.

Yesterday i took my kids to the park and the store while he was at work. After he came back, he began accusing me of cheating and whoring around. He refuse to listen and accept my assurance, the truth, and claims that he knows i cheated already.

He told me that since im like this to him, (a cheater and slut), i need to let him go, and let him go find another one for him before he gets too old for anyone to like him. He says hes getting old and ugly, i need to leave him now while hes still handsome. He also said that he doesnt care, cause hes getting old and he needs a life(family).

I said to him that because he bought that up, he probably wants out and wants to find someone new. And he got very angry about it.

Btw, i just gave birth 4 days ago. We have 3 kids under the age of 3. And throughout our marriage, he was the one that strayed, many times. What should i do and what do you think?