Why would my ex randomly reach out like this?

Anonymous
She messaged me randomly a few weeks ago, was actually pretty talkative, and it felt a lot like how we used to get on when we were together. We ended up messaging for a few hours, and she seemed like she was open to reconnecting and catching up. (On the surface as friends. But I think mores going on)

At a point she opened up that she hid her alcoholism from me during the relationship and is mentally unwell (Supposedly no one knows about the issues other than me)

And did mention her current boyfriend, but is pretty obviously not happy with him and is on her last ropes with him.

Some other stuff was said about what we've been upto and stuff, but at the end did say her boyfriend found out about me and wasn't happy, and removed me again the following morning.

(We did agree we wouldn't talk anymore if one of us ended up in a relationship, but seems like thats not really a thing now)

I guess it can be breadcrumbing, but I really doubt it based off what I know of her from the past and how we spoke this past time
Why would my ex randomly reach out like this?
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