Hello there!
It's a difficult one because you need that trust and if that trust isn't there it's not going to fair well if you get married. It sounds like he wants to do something about it though. We can't tell you what to do but you know communication is the answer. I hope you can both figure it out. Welcome to Psych Central!
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Pegasus
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“Everybody is a genius. But if you judge a fish by it's ability to climb a tree, it will live it's whole life believing that it is stupid.” - Albert Einstein