What should I do?

So me and this guy have been good friends for three years and we don’t really see each other anymore besides after classes but I had a crush on him when I saw him all the time and the feelings are kind of coming back!!! He always pushes me and hugs me and says that he misses me and like I kind of want to fuck him??? Like he’s just so sweet and he always tells me he loves me and I miss him. Like I don’t know if I should act on it or leave it alone because it might ruin our relationship!!!