He said “I need space”

Hey guys so I’m not very good at the relationship department because I have only been in one before and it was just so unhealthy and toxic. I finally met the guy of my dreams but I fucked it up by not realizing my own toxic ways. Instead of trying to really change, I thought he was just suppose to learn and deal with my ways. I would let my temper and attitude get the best of me especially with all the personal things I had going on financially but I would never be honest with him about those things because I was embarrassed. I know he would’ve understood and supported me but you know how pride is. He reached his enough is enough point and said he wanted space but still wanted us to be friends. He’s literally the guy I prayed for so I can’t bear to lose him but I also know where my accountability is. I want to respect his decision but I also want to

Fight for him. I wrote him a letter - a long one - that I plan to mail him soon. I just explained everything I never said and what I was battling with and just apologizing. I just need to know if I should send it or just advice on what to do...🥺