I'm sad and just need advice

My ex and I were together 3 years and have been broken up for 2 months. A little back story, we always loved together, had a stillborn son which caused much trauma for us both ,anger and grieve and we took it out on eachother we just couldn't figure it out together but kept having miscarriages afterwards when we'd try to fall pregnant again too so that also started to become depressing. We fought a lot and things got bad but I wanted it to work so bad this is my person y'all🥺 I was willing to do anything to get back even close to what we're used to be. He broke my heart bad though, I was miscarrying another baby while he packed up everything in our home and moved out, that broke me to pieces watching him leave our dog, myself and our life we have built together. I know I became a problem when I was drowning in grieve with no one to talk to when we lost our son,I became angry and isolated, the only one I wanted to talk to was him and he would shut me out, that pain of losing a child like that does something to you I can explain and makes you just evil, I never intentionally wanted to be mean it just happened I needed him so badly and he acted like everything was fine ,I was willing to do counseling or anything to fix our relationship.My auntie found him on tinder not even a week after he left me and that fucking hurt.. I'm still struggling two months later with everything , I think about him constantly,love him deeply still and just wan things to work. We don't talk at all , he has me unblocked on fb but still nothing. I am hanging onto some hope but I really think he's just done. I have no friends and no one wants to talk about this. How do I just start to be happy again ?? I don't want to date ,I am scared of loving someone else I'm scared of ever having a child with someone else I just wanted this to work so badly with us and still do.