Do you regret things you've done?

I've noticed lately that a lot of my dreams are very emotional and are full of things that I would change if I could. My parents always told me to live it up in high school it's going to be the best time of your life, I didn't live it up and was fairly depressed in school. I now regret all of my high school years and it's appearing in my dreams.

In my dream last night I was at a huge upscale dance or party in a fancy hotel, I was dressed in a black tux and a red tie. I arrived and looked around a little bit, there was just this feeling inside me that felt like extreme sadness or regret I can't explain it. My ex girl friend from a while ago walked in, her name was Amber. We both caught each others eye from about 30 feet away, she just had this look on her face that just drew me in. It was a look of intense passion and sadness at the same time. I broke up with her in my high school days and I just felt the urge to walk over to her. I had this overwhelming feeling to just give her a huge hug and I did. It was probably a 20 second hug and it felt so good... I whispered I'm sorry for what I did in her ear. It felt like I was comforting deep sorrow that she had, almost like someone she loved just died.

Throughout the whole dream I was pretty much crying and felt very depressed and alone, but I also feel like it was therapy. My dreams are clearly showing me things I regret doing in the past, and I often have dreams about high school which are hardly ever good ones.

I just had to post this, the emotion was crazy... Has anyone had these feelings in dreams before, this isn't just normal sadness and passion it was amplified within the dream and gave me a truly amazing experience. Also do you dream about things you regret?