I think I still like my ex ‼️

Hey everybody this is my first post and I don't know what to do about the situation . Ok so I have this ex who I still have feelings for and I just can't bring myself to get over him . We were on and off since 6th grade and we are now in 10th grade . The last time we dated was 9th grade . Since then we've talked and texted a bunch of times . We're still friends .  Last summer he told my cousin that I'm pretty and that he would date me again . But he hasn't made a move since .🤷🏽‍♀️ But we've talked a bunch this year . One of the problems is when we last broke up he started to mess around with a lot of girls in the school . And now he's not doing anything for himself in school . He barely comes to school and he gave up on basketball . Should I tell him I have feelings for him or is it just not worth it ? Should I let him go and remain his friend ?