what to do ?

i'm 15 and i've liked this guy for over two years and we had a "thing" but it never worked out because at the time we hog weren't very confident. its been half a year since our thing and i thought i had got out of it and was able to get over him but turns out i'm falling back in the trap, do i block him out again or say fuck it and go for it again. pls comment advice 🌹