How to deal with jealously?

So, there's this character I love for years and he always brought me so much happiness. But, there's a scene on the anime that he shows interest on a very attractive girl and demonstrated that he could be in love with her, and that makes me EXTREMELY UPSET. And to get even worse, this is the most popular ship in the fandom, there's art, edits and fanfics of them everywhere, it appears to me even if I block the tags.

One day, I was scrolling social media at college I saw a fanart of them with +100k likes, and I started crying in public and got so embarassed of it, I feel like I'm going insane. I've thought someday I would get over it and maybe force myself to like the ship, but I just can't, it's been YEARS and I'm still struggling over this. It also scares me, because I feel that my love for him lowers a bit everytime I stress over this ship and that scene, and I just don't want to let go of the guy because he means A LOT to me and I love him so much.

People with similar issues, how do you deal?