<human>: Summarize the given text in a few sentences.

My boyfriend and I dated for about a year during high school. I was around 18 when he ended it. There was no cheating, or arguments, or any abuse -- he simply said he could not love me. Nothing else. Suffice to say, I did not understand, and I was not mature enough to deal with it properly. He was my first relationship, so it hit me especially hard. I contacted him excessively in an attempt to understand, borderline stalked him online, and I even lashed out once when my depression over it hit an all-time low. After that, he agreed to a long talk which cleared up some things and finally helped me start to get over the relationship. Looking back on it now, I want to kick myself for how childish and irrational I was being. That was roughly 2 1/2 years ago. I realise I'm still young, but in comparison to what I was, I've emotionally matured in leaps and bounds through other circumstances since then (that aren't relevant here).

We've kept in touch since then (maybe 3 texts a month?), but only recently have we begun going to the same university and have had a chance to see each other regularly and begin to repair our previous friendship. I have no intentions to try and get back together, but I feel as if I need to tell him that I'm sorry for how I acted when we parted ways, and that I've let go of that anger towards him.

Ordinarily I realise this may be a stupid thing to want to say to an ex, but he is an extremely emotional man with some hang-ups here and there. I believe my reaction caused him to become more depressed himself, believing himself to be a horrible person for how much he hurt me back then. He began going to counselling afterward, and he went for a long time afterward. We both want to be friends, but I am afraid that that "you hurt me deeply" barrier will always get in the way. I suppose all I want is to ask if I can ever have his forgiveness for my past actions. He has apologised to me many times, so I feel that it is my turn to take responsibility.
<bot>: Want to apologise to ex for how I acted after our break-up. Is it a good idea to bring it up, or should I let sleeping dogs lie?