I love my boyfriend, but attracted sexually to someone else?

i have been dating him for over a year now and i truly love him and he loves me too,but there's another guy that i used to date and i am still attracted him sexually i dont like him or anything like that but im still thinking about the sex and he has given notice that he feels the same way but i still dont like him other than that because now that i think on it he was a cheater, a liar,untrustworthy,irresponsible and he could be really mean too. But since i started communicating with him again i keep thinking back,and im really unsure about what to do.