Is she unhappy with her boyfriend and considering leaving him for me?

Hi so I really like this girl and she obviously knows it. She has a lond distance boyfriend with whom she broke up and got back to several times in the past. The thing is besides the chat box, she and I have a kind of other secret channel to "flirt" mildly (not gonna describe it, to complicated). But when we text each other we both pretend not to know what is going on in that other battlefield. We just text about casual things like hobbies and some deeper topics like points of view but she never mentions her boyfriend. We text a lot and even after midnight.

Today she wrote on the other secret channel that she is "free and lonely". I saw that, texted her and we talked for 10 hours straight! It's the longest we've ever talked to each other and also my longest texting ever. From her speed of replying I'm sure she didn't talk to anyone else at the same time (unless she types like lightning).

I don't understand this. I really want to be with her and get her out of such a back and forth relationship but I'm not sure what she has in mind. Is she flirting seriously with me? Girls do you do this to a guy who obviously has a thing for you but whom you don't love back and have no intention to be with?

Is she unhappy with her boyfriend and considering leaving him for me?
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