How do I stop feeling this way?

There’s a guy I used to talk to, we were toxic for each other and he was quite frankly and asshole to me but I used to let it slide. Despite the fact that we haven’t spoken in a while, I still find myself thinking about him from time to time, which will eventually fade away. But for the mean time I really do miss him and taking a lot in me to not message him again. Because I’m afraid that if we do not talk he’s going to forget about me. I don’t want him to forget about me. I like him so much even tho he doesn’t reciprocate it back to me. How do I stop feeling this way? What do I do about him forgetting about me?
How do I stop feeling this way?
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