<human>: Condense the text into a few key points

Let me start by saying my Father and I never had a good relationship due to my teenage angst at the time, I was 16 when my parents divorced and my dad and I fought every day up until the day I moved into my moms new house. For this reason, when I look back at my parents divorce now, as 21 year old woman, I feel guilty. My mom and I have always been very close, and even as a teenager it was clear she cared about me and my feelings much more than she cared about anything else. So when my dad and her were having problems, and she was contemplating leaving him, I encouraged it because I couldn't stand living in the house with him anymore. Don't get me wrong, my dad did have some problems in the past (he first was a recovered drug addict before the divorce and then in recent years became sober of alcohol as well.) My mom got sick of his issues, as well as the mean attitude that came with them, and ended up connecting with an ex on Facebook and basically just up and left my dad, rushed into a marriage with her new husband who she now resents. She says every day how unhappy she is. She constantly tells me how she misses my dad, but says it could never work because of the way he treats her. Now that my dad has been through a lot of therapy and has really changed his path, we get along great now. Being that he never had any family besides my mom's family, he feels really lonely and it's kind of obvious he's waiting for my mom because he knows she's unhappy. Every time I visit, I'm faced with the feeling of guilt because I feel like I could have prevented this pain he's feeling, as well as my two siblings felt based on the divorce. I was the only one happy at the time about the divorce, and now, 5 years later, I feel the most guilt and sadness. My dad has changed so much, and I don't know what to do to make this better. Or just to make myself feel better. Really need some advice. Thanks in advance.
<bot>: feeling sadness and guilt about my parents divorce now that my dad and I are on good terms again, and my mom is in an unhappy marriage.