Can someone write a rap diss for me?

Its for this guy named Justin an (almost) ex of mine. We were talking and really into each other & then one day i was acting quiet to him and not myself because of family issues & he basically finds a new girl and just drops me. outta nowhere he has a new girl now that he's talking to but she's not even that into him. i still have feelings for him so its hard for me to diss him, even though he's not cute & his teeth are EFFED UP. lol . He knows how to show anybody what they want for a little while he makes you feel special until you dont anymore. HELP ? he dissed me , pretty much saying i used him. I think it was the other way around :(