SEXED N CONFUSED

I am so confused me n my ex or my boyfriend ( see how confused I am!) We broke up last week due to his infidelity and I tried my hardest to stay away from him because I knew it would be hard for me to resist his advances but I finally let  him come see me the other night and of course I gave in. What I can say the sex is  magical. But now I feel like Im leading him on because I dont to be with him. Now I think he beleives that we are reconciling. But I guess this is payback for all the hurt he put me through. Should I continue to have sex with him?