I’m lost 😔

So I found a message from my bf to this female he haves on snapchat calling her cutie and saying how hot she looks and it’s not the first time I find this type of messages. I don’t mind him having friends but sweet talking to another female is a big no to me. I’ve confronted him in the past about the situation and he stops for a minute but does it again. I ask my self why the need to talk like this to a girl knowing that you have a gf and live with her, he says that he’s not cheating that he’s just saying hi but why say hi like this.. I feel betrayed and disrespected at this point I haven’t caught him cheating but I’m lost because I really have dip feelings for him so I don’t know what to do to leave or stay