University boyfriend, together for 6 very happy years until he broke up with me out of the blue "to find what he wanted in life" and stomped on my heart in the process. I went totally NC for 2 years, did all the cliché self discovery things, (got into running, progressed in career, travelled, dated). Grew a LOT but never really felt "over" him. Finally agreed to see him again recently and to my surprise he makes a huge declaration, apologises for everything, tells me he fucked up, says that I'm the love of his life, that he will do whatever it takes to get me back etc, reveals that he's been to therapy and some a lot of self reflection. I was shocked and skeptical at first but after seeing him a few more times I'm starting to believe him and starting to consider giving him a chance.
The dilemma: every rational part of me knows that I should take things very slowly & that its not wise to rush back to exactly how things were. That I need to take my time to make sure this is what I want, to rebuild the trust, to make him prove he means it. BUT I've got no clue how to do that in practice. I've only ever had two settings for him - full on boyfriend or zero contact, so now he's back in my life I'm not sure how to handle it.
How do you test the waters of a new relationship with an ex without immediately falling back into the same emotional intimacy, frequency of contact that you had before? How slow is slow? Any advice from anyone who has been there would be much appreciated.