Alimony

Please no judgements... My boyfriend has been going through a lengthy divorce. Separated for quite some time before him and I got together, in fact she has a new boyfriend as well. Her relationship seemed to have started while my bf and her we’re still cohabiting. Anyway, she is dragging out the court proceedings and now is requesting alimony or maintenance. She is about 8 months pregnant with her new BF and they are living together. How is that okay?! She moved on, he moved on.... just end it. ( I know it’s not that simple though)