How does one conquer lust?

I am not sure how others experience lust, but for me it’s very consuming, especially when there is someone in particular I have a crush on. It distracts me from having healthy friendships with people I find attractive (mostly men). I fantasize constantly. I want to have healthy friendships with people, but my brain/genitals just don’t seem to work that way. It wasn’t a problem when I had a boyfriend and was being sexually sated, but now I just seem to be constantly horney. How do I make it go away?