Are you in therapy? It sounds like you could really use it. You went from one relationship to the next, and never gave yourself any time to process the last one and heal. It seems like you're carrying a lot of baggage and issues into to this new relationship. You need to address this all with a therapist to heal yourself so you can fully move forward.

And try to keep your insecurities to yourself. It will eventually push him away, no matter how loving he is. These are things that need to be addressed with a therapist. Stop questioning him on his marriage. Frankly? It's not your business to keep probing as you are and questioning him. It's not fair to him. Please stop for your own sake and his. What he did in his marriage should really be no concern of yours, unless he was a cheater and you didn't trust that he wouldn't cheat on you.