Our expert says:
This sounds like Pathological Jealousy on his part, and the puzzle is why, according to your description, he so suddenly changed, after NOT being like this for the first couple of years. You are not a therapist, and are unlikely to be able to change him. Could you persuade him to join you in seeing a marriage counsellor, to explore how you might be able to help him feel more confident, and how he could recognize how faithful you are ? And be sympathetic, not accusatory, makign it clear that you understand how awful his childhood experiences must have been for him, and how much you'd like the pair of you to be able to become more confident and happier, with the right sort of expert help.
If he really won't accept that there is a problem relating to his profound suspiciousness, then consider leaving him for your own sake.
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