What you're feeling is instinct, babe. And you should never go against that gut feeling. Because of a bad experience, I'm rather cautious about sharing any kind of info, but ten months?
I've used some devious methods to "catch" the frauds, but I certainly didn't wait no 10 months! Cripes, I have them found out within a couple weeks of meeting. And for sure, I have more info about them, than they do me.
It might not be that he's married, but maybe he's made up some stuff about himself that isn't true. Maybe he's a lot younger, or older? Maybe he's not all that good looking? Maybe, he's just scared that he'll lose you. When he calls you, can't you lift his number from Caller ID?
Just curious why you've waited so long before getting suspicious?