Is it truly possible to become emotionally attached to someone who your significant other cheated on you with? if so why?

Anonymous
This is a serious question, I was in a relationship with a narcissistic for two years and five months, at first it was just me and him dating for 6 months but he start it cheating at 4 months of dating me then around late November he got back with his ex but by this time around I was already trauma bonded to him so I was not able to just break up with we all three agreed to get in a polygamous relationship and little did I know my ex girlfriend who is now my friend was going to become emotionally attached to me we don’t hangout as often but she had bought me a Christmas present I had bought something for her daughter we talk everyday all day, she enjoys my company and I enjoy her company as well. I feel as if I inspire her as well I just didn’t know she could become emotionally attached with someone who she got cheated on by although I was my narcissistic girlfriend as well who is now an ex so I wasn’t just any girl, but with that being i never thought this possible especially because women resent the other women who that man cheated on with.
Is it truly possible to become emotionally attached to someone who your significant other cheated on you with? if so why?
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