Idk what to do

This will be a quick question. How do I stop myself from liking this guy that supposedly “doesn’t want a relationship or anything romantic?” I know this dude is toxic and is bad for me, told me he doesn’t want anything romantic with me because he’s not looking for a relationship and tbh I was okay with that. Before we hung out last Saturday. The two of us acted like a couple or even fwb without even kissing that day. But because of that I started developing feelings for this dude and they continue to get stronger the more we talk… So yeah what do I do?