Most Helpful Guy
becoming a friends at this time could make things worst and make you more upset. sometimes it's difficult to let go the one you loved, but at this time you should take care of yourself and refuse his offer (becoming a friends).
sorry for what you've been through, but be selfish and make your happiness more important than him, because doing the same thing twice in the same way and the same steps probably will make you more sorrow and break your heart again.
(If someone fools you once, shame on them. If someone fools you twice, shame on you).
give yourself a time to heal and space to live your own life comfortably.
just cut contact with your disturbing past to live a happy life with your beautiful present.