How do I get over a long term infatuation?

Question

I've been infatuated for this person for a long time. Over 10 years.
Though we have never really had a romantic relationship, we have been "FWB" about 10 years ago, and he's been in and out of my life since.
He's sending serious mixed signals and none of them are really good. I don't know if he's at all interested.
When we're not in contact, I think of him maybe monthly.
When we are in contact, it's literally non stop.
When I think about him I get overwhelmed with warm cosy feelings, butterflies, Euphoria almost. I know it isn't healthy, but I don't know what it is.
I want to be normal with him. He lives near my dad and I want to just be normal if I bump into him, because chances are that I will bump into him.
@G.G.
After the FWB thing stopped, we didn't have contact for 5 years. Then we stopped having contact for again about 5 years, now we reconnected since 2021 because he now lives near my dad, he started a business there in this small and really tight community so I'm bound to be bumping into him on events. His job is literally various aspects of events and he is very involved with the community so he's basically at every event in the area.
I get where you're coming from, with the thinking of him poorly, and I have tried that. It just feels like it's all forgotten when I see him.. ugh it just kinda sucks.
Obviously I have been with other people these last 10 years.

Answer

Think of him poorly, negatively, that he smells bad, that he’s abusive, that he kills puppies for fun, whatever you have to think about whether it’s true or not at least so you don’t have that God like put him on a pedestal feeling when you look at him. Being his back up plan whenever he wants you, of course, that’s not healthy, that’s just him using you and taking advantage of your good nature, that you’re a good person, and that you have feelings for him. You aren’t a back up plan when he’s not with somebody. Allowing him to come in and out of your life. Whenever it’s convenient for him isn’t fair for you keeping you holding on, stringing you along, whatever you may be feeling for this person, Maybe you need to cut them off for some time so that you can actually deal with these emotions and heal, maybe you need some therapy or journaling or yoga, or keeping yourself busy so that you don’t have time to see him, maybe you need to shift your perspective completely about him that he’s a jerk, that he’s an asshole, whatever it may be that way he doesn’t even phase you when you see. I think is uggh What does he want. Or just say hey dude and keep it at that. Distance￼ yourself. Or maybe you need to be with somebody else so that you are laser focused on that person and he doesn’t matter, maybe you need to do some actual healing and getting over him, stop focus on him and focus on someone else or focus on yourself, and better your life, learn a language, volunteer, there’s more to life than just relationships and then. Keep yourself busy so you don’t even have time to think about him.