Boring sex

As each day go by I just dont feel like having sex with my partner. Its like I be wanting to but he never takes me there anymore. Give me a lil foreplay or something I dont get none of that. I tell him lets have a little foreplay and his response is ared play with yourself. Like whatt . And everytime he tries to have sex with me I tell him no. Cause if im not into it im not gone fake it. Idk what to do & im scared he gone cheat but what am I to do when he dont wanna work with me. I dont think about another or even want to have sex with another man I want him but im just not turned on anymore.