This is not a healthy cycle for you. If it keeps repeating itself it will leave you feeling low about yourself. You need to start thinking about yourself and stop thinking about how you can please him and bring him back into your life. If he really wanted to be with you he wouldn't have broken up with you. If you kiss a man and offer him sex of course he's going to take it without regard of how it's going to affect your feelings. So that's where you need to be a little selfish and think about your well-being. Instead of trying to cut him out of your life completely try distancing yourself from him little by little. Then you will also see how much your company really meant to him as well. And at the same time you can make it easier for yourself to remove him from your life. Find someone who truly values you in theirs.