BOY PROBLEMS!!!!!!!!

Guys i need to rant and i can’t talk to my friends about this because i’m afraid it’ll get out but anyways here it goes:

Ive been dating the love of my life for almost a year now. He’s perfect he treats me so well and i love being with him. I literally would want to marry him. but there’s this boy that flirts with me and for some reason i never make him stop. IDK WHY! every other guy i would be like ew get the fuck away from me. this guy doesn’t do relationships but always says that he would for me. i don’t want a relationship with him but i just need help. what do i do about this? I don’t want to cut him off because we are good friends and itll mess up our friend group but for some reason i don’t tell him to stop. it is never anything more than hugs and just close proxemics.

HELP ME!