Who do I believe

So my mother and law were talking because my husbands baby mama is full of drama and she swore on her child’s life that my husband cheated with her when we first got together. But now we need to be cool because it’s in the past and we’re all family. I asked his mom and she says she doesn’t believe he would cheat on me and also she said the baby mama said she wish she knew my husband could be faithful otherwise she wouldn’t never cheated back in the day. Even his mom says he completely changed when he met me the baby mama has admitted it too.. She’s always reacting to something on Facebook laughing at it that has anything to do with cheating and is always posting about loyalty and telling me to be careful when one second she acts like we’re cool the next she’s trying to control every little thing saying I’m not the kids step mom I don’t even do anything for her next minute praising me for all that I do for her...her story doesn’t add up but my husband has acted weird in the past. Now this woman is crazy she’s tried getting him locked up by saying he’s abusive toward her and he’s literally never put him hands on me a day in his life... she switched up the story by telling his cousin that he was coming back to her but just told me he cheated cause they had bomb sex. She’s still not over him I can tell.. It’s just weird cause he would act like he didn’t like her but was always calling / texting her like everyday would even not respond to our convo but would answer the baby mama right away.. I would see he sent her picture messages but he told me it’s probably just coming through as a “long text message” cause the only picture he ever sent her was a picture of child support documents. But she mysteriously had a picture on her page of my man and the child but he claims he didn’t fuck with her like that or ever sent her anything but if he didn’t cheat why is he hiding all that from me ? My husband has sworn his loyalty to me and says this is exactly why he didn’t want me to meet her she says he didn’t want us to meet cause he and she were hooking up everyone warned me she was full blown crazy did he make her crazy or was she crazy on her own. Legit used to throw food cans at my mans head