Boy Help!!!

Hey Ladies,
I've known this guy for quite some time now and he liked me before and so did i but i didn't feel as if i was ready for a relationship. Anyways, he has now gotten over me but i haven't and he has changed so much. He used to be so sweet and kind and now he has turned into this fuckboy!! All he wants to do is to get with people and vape.
Please help, i don't know what to do and I can't seem to get over him and it's really making me feel like shit. 
Thankyou so so much !  xxxx