There are several threads here about once the cats sees the outdoors, they keep nagging to go out again. Thank God I don't have this problem. We go out regularly for restaurants, drives, grocery shopping, walks, parks and off road activities. She enjoys going out and enjoys staying in. But I have created an indoor Disneyland for her.
My advice is: 1) make sure it's not mating associated behavior. 2) provide all possible entertainment indoors from tree house, scratchers, playgrounds, toys... etc. I recommend One Fast Cat wheel and boxes. Check them out online. 3) add catnip or mint plants to your home, and try it in his food. 4) last resort is to opt for Civa Feliway plugin diffuser. (I don't use it but I read a lot about it).
Good luck...
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