My (35m) partner (34f) cheated and ran off with the new guy (31m) and now has issues keeping a roof over her head

Hello everyone,

Writing this on mobile, please forgive formatting errors.

I was in a decade-long relationship with the person mentioned in the title, we have a child together who is in 1st grade.

Recently, I'd discovered she was siphoning from our daughter's money I would put away every month (school fees and savings) as well as using her salary to fund expensive hotel/guesthouse stays with one of her employees under the guise of "work". I called her out on this as soon as I'd found out and her new guy's reaction was to send people to my house (she gave him the address, I would later find out) to "clean up everybody living in it" for lack of better terms. I wouldn't include this if not a necessary part of the story, please forgive if it treads any lines with the sub rules. Her reaction to that? I antagonized him by confronting her so no foul in her book, I am blowing it out of proportion despite multiple voice notes and text messages.

I kicked her out of the house due to obvious danger in this and her new guy cannot help her with a place to stay. Without giving too much away, she earns less than half of what I do and he earns a quarter of what she does. She's currently couch surfing around her friends'/relatives' places while he allegedly lives with his mother in a studio apartment.

Recently, she's contacted me to ask me to co-sign on a lease with her as she doesn't have any other options and while I want to help her because I care about her, I also feel she has made her own bed and should lay in it alone (or with that guy).

The consequence of all this up and down is that legally, he's not allowed anywhere near our daughter anymore so the two of them moving in together would likely mean she cannot see our daughter anywhere that isn't neutral ground because I don't want her at my place. She knows this and this is partially why she asked for my help as if the other guy signs with her, he will want to move in with her.

Should I feel bad and help her out? Should I tell her this is her doing and leave her to her own devices? Terribly conflicted… what do I do, guys?