Need advice 😔

My boyfriend and I just had our first child on October 10th. Unfortunately she got an unexpected illness at 10 days old and passed away. I have been hurting so bad but I’m to the point where I feel that I need another baby. Not to replace her but to give all this love I have built up. I’m so desperate for a baby, I’m sure many of you know the feeling. I just found my boyfriend talking inappropriately to other women. It breaks my heart because now I’m not sure if I should leave him or not and if I do, I cannot get the baby that I need so badly. It sounds crazy but I wouldn’t even care if he got me pregnant and then we broke up. That’s how bad this is. Or should I keep trying with him because he didn’t physically cheat as far as I know. Any thoughts?