Play With Other People's Minds

We haven’t been in contact for months and I still love them in a way I’ve never loved someone, but they don’t feel the same, and cut contact with me cause we were ex’s trying to be friends. I did almost everything with them so when I get with other people and do the same, I don’t feel the happiness I felt when we first did. I feel like crying about them and I love them so much but my love isn’t reciprocated cause they don’t like me. What do I do to try to get over them?