SEX HELP

My SO and I don't have sex enough. It's only about once a week if that. I've tried explaining it to him that I need more but he doesn't get it. I don't know what to else to do I try initiating it foreplay everything. I need ideas I need HELP! I love him and don't want to loose him or cheat but it's coming to the verge were I might end up cheating! Please help