It seems Jon can't take a little criticism, and that concerns me. Is it disrespectful to dismiss your views? Yes, and when you called him out on this, he didn't want to examine his own behavior, and instead accused you of being disrespectful.

I would want to meet someone from Jon's past who might give you insight on why Jon's previous relationships have failed, and then you might learn what you are getting into.

Also, I read your comment that indeed he 'love bombed' you. This is very concerning because it is an attempt to manipulate you.

Please take your time and don't marry him just because he wants to get married. You are important here and might be better off alone than with someone displaying some narcissist traits.