Feelings about people who like you larping medias you like

Anyone else feel kinda uncomfortable when people do this? Like they're suddenly sooo into the medias you value out of nowhere and will show it off at random?

Bit of backstory, I had this guy who's liked me for yrs, at some point he even stalked me home, waited for me in the streets etc, basically it was bad and I was traumatized af but I was young, dumb and honestly still am very patient with people so I forgave him and left him as a friend (kinda) , I've also rejected him 2x and never have him room for any wrong ideas bc I don't chat or hang with him alone. Anyways it's been a problem for me since way before bc he'd constantly start partaking in stuff I'm interested in that I value LOTS (Im one of those ppl who just can't stand it when others pretend they like something when in reality they're just doing it for attention esp something I love) fandoms, communities, etc. idk. Need some opinions rn, possibly other experiences or just something to ground me in general.

Please don't be rude for no reason lol I'm genuinely uncomfortable with what he's doing bc he's done this for yrs