How do you show an ex you've changed?

Anonymous
So my ex and I broke up a little while ago (about 3 weeks ago). He broke up with me and I am beginning to understand why more and more as days go by. At the beginning of the relationship, I was always very upbeat and happy, then out of the blue I got a vibe he wasnt very happy with me, so I brought it up with him, turns out I was just being paranoid. He was just upset about other things and I picked up on it in the wrong way. But I never shook the feeling for sum reason. So whenever I saw him, like when we went out, for like the first half hour or so I would be pretty down, you known not the person he was initially attracted to and I'm sure he picked up on it, because eventually he asked me if he was a bad boyfriend.i then told him I felt unappreciated, I don't know why I did, I was really just upset we didn't see each other more often. When he broke up with me his reasons were that he didn't feel the same way about me. He said that when we were together he felt guilty because he felt he made me sad, and the best thing to do was break up. I may have felt unappreciated but I wasnt, and by being sad he felt he failed as a boyfriend, and I know that made him feel less valuable and admired in our relationship. (Also when he asked me if he was a bad boyfriend I reassured him he wasnt by telling him I loved him.now that must have been confusing for him.) Though I've recently been diagnosed with cyclothymia, a very mild mood disorder, where I have trouble controlling emotions i.e when I should be happy I'm sad instead and can't willing snap out of it. But ill be starting treatment for it come August. I know my illness is what caused the break up because I was sad a lot for no explicable reason, and he thought it was his fault, he started to feel guilty, and then the lost feelings for me because being with me must have felt like a chore or a task. But everything was perfectly fine before I got so paranoid and sad.

So I guess my question is, how, in a months or so time, do I show him I've changed (with treatment my doctor says I should no longer have these unforseen and uncontrollable mood swings). I mean everyone says one way to get ur ex back is to show them how youve changed, but they never say how to go about it. Do I literally sit him down and explain what's going on or do I indirectly show him. It won't be until August mind you, but I still need to know how.thanks for any insight or suggestions in advance! =)
How do you show an ex you've changed?
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