To be honest , he doesn't need reason for divorce, if he wants he can get it. That's the part of being in US, people love it. It not like they want to get divorce but the freedom of choice it gives to people as right.

So if he doesn't like being with u, he can ask for divorce , and same is true with u. There is no injustice done to you. Marriage is mutual and trust. If one doesn't like it, he can get out it. May be its mistake in your part to get into marriage with out knowing him completely. So you don't have choice other then let him go and live with it. Learn from mistake and do better job next time.