Ahhh, so that's it.
And yeah that's pretty decent and noble of her.
However it's a little like your family and friends sticking around while you suddenly can't get in touch with your client for your job. They're relationships that serve different roles, and one can simply be friends with former benefits in the worst case. I'm not saying it's not a good idea if she wants to leave, but Bern is clearly attached.
The sorta religious law most often cited with regards to adultery is the Ten Commandments, which kinda says "Ummm don't do that."
However, unlike staunchly Christianity which basically codified monogamous relationships and which is a dualism, Judaism is a monism and... well it's complicated.
https://www.differencebetween.com/difference-between-monism-and-dualism/Basically, the Jews believed matter is all one substance, and despite having multiple wives in Jacob's and David's and I think Solomon's case, they had a rule that says adultery don't do it. Which seems VERY hypocritical that you have multiple wives in a system against adultery, until you understand monism. In dualism where this and that are two different things (God and human, God and... well not God, man and woman, two different partners) this means literally "keep faithful to the one you love" or to quote a 50s or 60s song "be true to your school, like you would to your girl."
https://www.youtube.com/watch?v=CdffgfM_YWQJudaism as I say, however is a monism. They say stuff like the Shema Yisrael for exorcism. (Basically that God is One, so the reason it's for exorcism is that it means evil spirits cannot exist) Read this way, it's kinda similar to saying "don't commit adultery because you really can't, there's no difference between you, me, and the other girl. We're all one, and this is a sin because you're hitting a false perception that I could be jealous. I'm only jealous when you stop seeing me as your lover." This is kinda similar to what May's been saying, and remarkably similar to this song.
https://www.youtube.com/watch?v=uuZE_IRwLNIYou know, the real reason I went into this religious history discussion was so that I could shamelessly plug songs.