I Am Heartbroken that my Friend With Benefits is Getting Married and Wants to Remain Friends

dear Ella..
 
I’ve been in love with my friend for over 5 years. We’ve been friends with “benefits” for over 2 years. Over the years, he always assumed we were just friends and as for me, I agreed with everything he said because I loved him. He told me two weeks ago, he was getting married to a girl he was into for many years. She finally accepted his proposal. I was devastated when he told me the news. I decided then I would cut him off because I could not handle it emotionally. I just wanted to crawl up in a hole and cry. So I cut him off. It was only a week since he didn’t hear from me. He got upset and came to see me. He said he was “hurt” I stopped talking to him. He still wants us to be friends and couldn’t understand why I didn’t want to carry on as we were. He didn’t think it was a big deal that he was getting married but we could still maintain being friends. He couldn’t forget me and he will never erase me from his life. How can I pretend to be his friend?
I’ve been sleeping with him for awhile. I couldn’t imagine being introduced as his “friend” to his wife. He said everything will be normal and even I’ll get married and it will eventually all work out. What should I do? Continue being there as his “friend”? Why does he still want me around even though he’s marrying the women of his dreams?

Is he just using me?
I am so confused. Does he genuinely care for as a friend? He says so but somehow that explanation doesn’t sit well with me. If he loves his future wife as deeply as he says he does, what does he need me for?