Stuck in between

So I’ve accidentally gotten myself into a situation that I have no idea what to do with. I’m single, so personally I think that I can talk to whoever I want and however many guys I want. If you don’t agree, don’t tell me, I really don’t care. There’s these two guys that I’ve been talking to recently, both for about two weeks. I did not expect to catch feelings for either of them and definitely didn’t expect either of them to catch feelings for me. But that happened. And now I don’t know what to do. They both want something serious. Usually I wouldn’t have a hard time choosing but one of the guys had been in a long relationship and he was so in love with her but she left him for another guy and knowing that it would be EXTREMELY hard for me to just leave him for someone else. I can’t stand the thought of him being hurt like that again. But the other guy I like a whole lot and again I can’t stand the thought of him being hurt. I don’t know what to do. I’m so confused and stressed. Please leave some advice I need it