<human>: Summarize the given text in a few sentences.

I've been with a girl for about a year. She had two dogs when I met her, one she had for 4 years and one recently adopted (let's call him Toby). About 6 months into the relationship we adopted a 3rd dog and we had a pretty great dog family. Well, we recently broke up and I kept Toby, as he does better where I live than where she lives. She kept the other two dogs. Toby has had a "brother" for over a year and a "sister" for the past 6 moths, so almost always had another dog to play with. That's gone now and he's visibly sad, less energetic and more withdrawn.

Even though I'm coping pretty well with the breakup (after watching some good YouTube self help videos), every time I look at Toby my heart breaks all over again. I hate that he's suffering as a result of my relationship not working out. I know I can give him all the love he will ever want, but he needs a sibling and I'm not really in a position to adopt a second dog on my own right now.

I realize that I'm likely projecting my own sadness onto Toby and it's probably part of the grief and healing, but it's hard to handle the feeling that I tore him away from his family. Any advice for those of you who "split up" the furry kids after a breakup?

Thank you.
<bot>: Dog is sad after losing his "siblings" during a breakup, looking at him breaks my heart and is making dealing with the breakup harder.