There are various reasons, some extremely unimportant, while others that bode well. Here are a couple:
He considers you only a one of a unique conquest
A person like this needs to get his conscience checked; they are frequently ones that lone say and do the correct things with the goal that they can state they inspired you to help their own self image.
It takes a lot of development to remain unwavering to somebody. if they’re not at that level yet, at that point there’s a decent shot they aren’t the one for you.
Instability draws out the more terrible in a ton of us, and in a man who’s shaky either about his looks or his masculinity, they can convey bedlam to a relationship.
He wants to leave you
Tragically he may arrive at the conclusion that he simply wouldn’t like to focus on you any longer, so he goes and finds another relationship to ensure he doesn’t wind up alone when he closes things with you.