I had been going out withdating her for about ten months. I had been dating her for about ten months.

"dating" is a nicer word to use in this sentence, however "going out with" is fine to say also and is commonly used

One of the reasons is that we had decided to break up when I goas that I'm going to study abroad next year, but the main reason is that I was growing apart from my girlfriend and she couldn't stand it. One of the reasons that we decided to break up was that I'm going to study abroad next year, but the main reason is that I was growing apart from my girlfriend and she couldn't stand it.

One of the reasons is thatwhy we hadve decided to break up when I go tois due to me studying abroad next year, but. Howvever the main reason is that I was growing apart from my girlfriendher and she couldn't stand it. One of the reasons why we have decided to break up is due to me studying abroad next year. Howvever the main reason is that I was growing apart from my her and she couldn't stand it.

Although I didn't want to break up with her, I couldn't hold her upback because the fault is minwith me. Although I didn't want to break up with her, I couldn't hold her back because the fault is with me.

She was beautiful, attractive, and thoughtful to everything likeand everyone, even animals, plants and things like that.more. She was beautiful, attractive, and thoughtful to everything and everyone, even animals, plants and more.

Putting "more" at the end is a more thought through way of ending the sentence

I wish her all the happiness from the bottom of my heart. I wish her all the happiness from the bottom of my heart.