It appears that your mum did have good rasoens for not liking him. Friends with benefits? Are you you even comfortable with this? He wants intercourse and oral sex if we become FWB What about you, my dear? It sounds like he knows what gonna benefit him than you know. Why do you even want to stick with him if that's all he wants. He seems selfish and manipulative. You will be the one gonna get hurt, for sure because he's not even interested to commit to a relationship with you. If you commit to being FWB with him, Im afraid he will take you for granted and it's only a matter of time, he gonna lose respect for you. Don't let this guy rob you of your dignity. You must be firm about telling him you are not interested in just being FWB. You are so young, there are plenty of guys out there, don't waste your youth on this man who doesn't seem to know how to appreciate you. You deserve a better man.