I think talking it out with your partner is the best and only way to really resolve a situation where jealousy is an issue. If you can put yourself in his shoes and let him know that you're trying to understand where he's coming from, I think that would be a good way to start the conversation. Then explain to him why he shouldn't be worried or jealous. Listen to his concerns and try to come to an agreement at the end.
But, keep in mind that sometimes when a partner is jealous, it's because they have done something to damage the realationship themselves (cheating, etc) and it may be more than a jealousy issue.
Good luck!
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