How do I stop fantasizing?

It seems every night now before I go to sleep and after I wake up in the morning I keep fantasizing about a relationship. I don’t mean sex (well ONLY that) but also just like doing regular relationship stuff like cuddling, kissing, spending time together like I’ve created this fake relationship with a fake woman in my mind and it fucking sucks. I also daydream often about stuff and I hate it because it’s pure delusion. I’m trying to quit my porn addiction but I keep going like this I’m going to fold.