Crush by Crush

Hi when im in grade seven i have a crush im taller than him and we have a good relationship between us but when months and months past, he chatted me like "how are you" then i always answered him like im fine how bout you then the past few minutes he will answer he keep doing that on me.... Then he is asking me if i dont have a crush on him or i have a crush on someone else and i say "i have a crush on you" and he aswered me like "ok" then when the time comes that i ask him if he have a crush for a long time he said "yes" and it is a another girl. And when i always think i should gaved up on him i didnt think on him. Then when 1 month ago i already moved on for my feelings oh him. After that i have a admirers, but my friend that has a secretly admire on me, i asked him if who was his crush and he says "you" then i blused, but im not believing on him. Then after a few weeks i have a SPARKS on him but other girl has a crush on him thats why im not letting myself to have a deep feelings for him.
What should i do to my PAST crush?😕
What should i do to the person that i have a sparks but I can't letting myself to have a deep feelings for him?😕