Did he break up with me because of her?

My ex broke up with me a month ago. Our broke-up was so wired coz we didn't seems like having a big fight or something like that. At that day we broke up, he even said he love me and he miss me. After I ignore him for few hrs. He called me and said he wants to break up. I begged him and cry on the phone. Let him not treat me like that. But he still broke up with me. The second day, I went to his work place to find him and even said I gonna kill myself to let him get back to me, but it doesn't work. He said he love me but just don't have feeling to be with me anymore. And he has some mental problem, he said I make him worse. He block me on every social app. He wants us to be friends. After that, I found him for so many times and so many reasons. I think the broke-up is all my fault, and I'm worry about him. However, my friend show me a photo about he comment on other girl's post said ' my love' or 'my darling' something just several weeks after we broke up. And just one day after he told me he will not in a relationship he need to fix himself. And the girl is the one he usually talk with on Snapchat during we r together. And I suspect he has a thing with her, but he said no she is just his friend. I felt like I'm fool and I was so angry, so I sent a message to him, but he reply me I'm ruining his life and he try to protect that girl, and said she make him happy when I make him feel bad. I just want to know that did he cheated during our relationship and if that girl is the reason we broke up or not
Did he break up with me because of her?
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