What's the right thing to do?

i'm going to sum this story up as much as i can. i've liked this guy for over a year now. honestly i fell in love with him. we dated off and on for a while but then he found a new girl, but he still texts me constantly in a flirtier way and i feel like he's cheating on her with me, but it's his choice, i love him so much, i can't stop it. anyways, i've been so desperate for him that it's made me do things i wouldn't usually do (send 🍑, be kinky, etc.) to try and get him back. and he constantly sticks around, even though he has another girl and i feel like he's just using me, but i can't let go because i love him so much. so what do i do?