No, it doesn't mean he isn't interested in you anymore. It means he's a creep who doesn't deserve you and you should move on and find someone who appreciates you and respects you sooooo much that they wouldn't even dream of cheating on you.
What is it with some people and commitment? Your question sounds like you're young..I think. Take the initative and tell him you need space. See how reacts. You'll know for sure if he has left already. Best luck
I'm sorry to hear about this. My ex bf flirted with other girls but I stuck around because he said he was just joking and blah blah blah. But then it got worse.. I would break up with him. You deserve someone who treats you right. Not some little idiot who flirts with other girls.