should i dump this guy?

we have been friends for a couple years and started sleeping together/dating about 4 months ago. I thought he was different and a "nice" guy so i gave it a shot into thinking we would build a solid relationship. He is not always responsive now, he friends other girls on social media and likes their pics. He talks to me about other girls that he tried to date in the past and who he hooked up with. He even mentioned the other night a "friend" he has that he went to stay with for a night down south on a business trip and he thought he would end up with but she is too messy so he knows he could never live with her but he could live with me. I think he is too immature or disrespectful or both? some friends say its too early on in the "relationship" but isnt the beginning of things suppose to be the best and honeymoon like?