Ok guys, put yourself in his shoes and tell me what you think pleaseee?

There is potential for great harm to you here. You are more than a physical body and if you engage in this FWB or giving yourself to either one of these people there will be damage done to you. You already were honest about the experience where you were "clingy" and he dumped you. Your value is much greater than this. Treat yourself and your body w/ respect. There will come a time when you are safe in a relationship and will be able to enjoy all of the benefits w/ none of the guilt and angst.