<human>: Can you summarize the given text in a few sentences?

About 4 months ago in December my ex broke up with me before I was sent overseas where I now live. We were high school sweethearts and then I joined the military, she was in college. Then it became a long distance relationship. We were together almost two years.

I wouldn't say I was the best boyfriend, and I know I had made mistakes (a little controlling at times.) She broke up with me because she was stressed out from me and school. It seemed at first that I wasn't too much to blame, but that quickly changed.

It turned out to be a bad breakup and she's blocked me from Facebook, email, and I can't even say phone because I have a Japanese phone.
All I want to do is apologize because I feel responsible for her heartache. I still think about her a lot, and I want to send her a letter.

Should I be even trying to talk to her? Will I come off as a crazy ex? Or creepy? I don't know wether to send this letter or not
<bot>: In the military, girlfriend broke up with me before I got stationed overseas. She's blocked me from everything, don't know wether I should try contacting her with a letter.