What to do with excessive knowledge of ex's interests after a breakup?

the title already explains it, to be honest..
my then boyfriend talks about cars, racing, machines and car-related animes to me all the time even though it's not my thing. but trying to be a good girlfriend i tried to put some interest into it, and i now have so much knowledge of cars and racing games that are in his opinion would be a great game. all i kept thinking when i'm around people discussing about these things are how much he'll enjoy it. i just wanna forget about cars and everything that has anything to do with it since I'm not really a fan.
What to do with excessive knowledge of ex's interests after a breakup?
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