Help?

ok.. so me and my boyfriend have been together for 2 1/2 months. I have reason to believe he is a cheater. #1 I saw messages of him calling his EX baby. His excuse was that's my ex. All of yall are my babies. Then he had her send a message saying nothing was going on between them (I didn't read it) and apparently she has been over his house. #2 Recently I saw him make a status for another one of his exes. I look on her page and I saw a status from her saying "I want that one person back and I'm going to get him back" and he reacted with the heart reaction. I messaged her to what was up and she said they are just friends and she's married. Its a lot to this story but that's the main part. I just need some advice or help because I'm confused.