<human>: Give me the gist of the text in a nutshell

I have been seeing this guy on and off for years now, it started in my first year of Uni then it stopped for a few years while I had a boyfriend. Recently we have been meeting up again and I have had a sobering realisation; I am totally in love with him. 

When we hang out together everything feels so right, I feel like I want to look after this man, the conversation is stimulating and the sex is great. I feel like a better me around him. However he has told me on multiple occasions he does not want another relationship ever again.

So some back history his first long term girlfriend cheated on him multiple times and really broke down his confidence, his second long term girlfriend was extremely frigid in bed and they had a terrible sex life. Now since he is a single, smart, attractive and a little arrogant he just sleeps with multiple women and says he "he doesn't want to feel responsible for anyone" or "anyone to feel responsible for him." Last night when I further queried him on this he jokingly said "when you have a partner you can't go fight a dinosaur... they would stop you and I want to be able to do what I want." He has also told me that when any of his other 'women' ask him to be in a relationship he immediate distances himself then cuts contact. I want to talk to him about this but I am terrified of losing what I already have. Being with him occasionally is better than not at all. Also I'm not stupid I understand he is probably treating all his other lady friends the same as me. I just feel if I could somehow show him that I'm not a cheat, (he knows I'm not frigid) and would fight a ton of dinosaurs if he requested he might change his mind.
<bot>: In love with my friend with benefits, he doesn't want a relationship, is there a way to change his mind or should I just leave things be or walk away?