Need some advise please.long post

My boyfriend and I have been together for 10 years, we have 2 children together(8 and 5) he has always been extremely immature and I did everything from paying all the bills to taking care of the kids and all the cooking, cleaning. we started trying for another baby 3 years ago....BUT a little over a year ago he broke up with me because he said he wanted to be happy. It blew my mind. Well about 2 months after I moved out he told me he made a huge mistake and he just needed to clear his head and he wanted me back. I told him he was not ready, he hadn't grown up and he needed to work on himself before I would ever take him back.

After 5 months of being broken up I finally saw change, I watched him become the man I had always dreamed of him being. I told him we should give it a try. Things have been amazing, he helps with everything now. He is paying his half of the bills and he truly has matured and we are finally happy....

BUT then he dropped the BOMB!!! Another woman was pregnant with his child. I may be crazy but I stuck around. I found out i was pregnant and unfortunately i lost my baby at 8 weeks, on the same day his child with another woman was born.

Question is am i crazy for still wanting another baby even though he now has a 2 month old with someone else? I feel so silly, almost embarrassed.

I try to look at this crazy situation as, if this didnt happen I wouldn't have the amazing changed man that I have today.

I feel like my overthinking and my sad feelings that another woman gave him a child is causing me to be paranoid and i think I'm kind of bringing our relationship down in a way. But I'm not really sure how to get over this, I'm trying but I'm still heart broken.