Relationship advice

I just recently found out that my bf had 2 miscarriages with his ex btw he does have kid with her. I knew about one cuz he brought it up years ago nd i thought being that it wasnt a regular subject to talk about that he had told me everything about that topic. Well yesterday i found out from his mom cuz she had the paternity papers that he needed that she had also seen that his ex had 2 miscarriages. Me nd his mom didnt know who the first one was from cuz she has had multiple kids by different guys. His mom nd i only knew about the one with my bf. So i asked him if he knew nd he sed yes nd then told me it was with him as well. I geel really hurt that he didnt just tell me all of it when he brought it about the one miscarriage. I know we werent together but to me pregnancy nd miscarriages r life changing events nd if u bring it up y not just tell everything. Instead im finding out from his mom nd having to ask him about it. Of course when he told me about the one miscarriage i never thought to ask if there were others cuz i thought he had already told me everything on that topic. I feel really hurt about it nd hes saying im being crazy for feeling like he kept that from me when he the chance to tell me. I just would have rather heard it from him in the beginning than find out the way i did.