I am pissed and feels very depressed

My husband has recently been talking to his ex girlfriend on hangouts. I just had out first baby. I have been dealing with post partum depression

I ask him if he’s talking to her and he said no. I go to his g mail & see a different thing she asked him for $ , he hasn’t sent her any as far as I’m aware . And SO FAR.

I tell him how depressed it makes me that he wants to talk to her. He lived w/ her for a few years , and was definitely emotionally involved. He cheated on me with a different ex of his several times and that is why it bothers me so much. He never had sex worn the girl he’s talking to on hangouts & she doesn’t even live in the country.

I don’t think it’s ok to talk to ex’s while in a relationship definitely not while married. He acts like it’s ok. I dont know what to do , now we are fighting in front of the baby and I’m feeling depressed