You are now the ex. Why do you even know this / who is oversharing this with you? For what purpose?
If those two are now taking advantage of an almost homeless lady? Ick.
If she's taking advantage of them to get a home? Ick.
If it's them rekindling their old thing and it's bona fide on that part but they treated you poorly? Ick.
I just don't see anything good in you knowing MORE info about them and their doings.
I encourage you to block on all the things and remove yourself entirely. Focus your healing and creating your next chapter. Not whatever is or is not happening in theirs.