Okay, let's hit this here and now. Redshirt Army has roughly the same sort of start I was going for, so I'm going to borrow that.
[X] There doesn't have to be a problem. I'm not gonna push you to do this as my "favour" or whatever, but frankly, with what I know? You and Mami can work things out.
[X] See, Mami responds poorly whenever you're brought up because up until I showed up, everyone in her life had eventually left her, or had been abusing her trust. She gets upset because she blames herself for not being able to help you, and for how poorly the two of you parted. Because even with you picking a horrible thing to outrage her over to get her to drive you away -- and no, I know that's part of what that argument was about -- she felt horrible for doing so.
[X] That's how I know that you and Mami can rebuild your friendship. Because Mami never wanted it to end in the first place, and the only reason you wanted it to end was because you were trying to punish yourself.