How long would you wait to be in dating market?

There's this girl that I went out with recently and she told me that she was just sad about her break up with her girlfriend so she went on the dating app but now that she found me, she deleted the app. I didn't think much of it. Later, after a month of talking and going out, we had a fight and I blocked her and within 3 days, she was on that dating app again. I saw that she was on dating market and decided to unblock her thinking that she is with someone else now but when I unblocked her, she started texting me. We went out again. And then I realised that she is talking to some other guy from that dating app while she is talking and going out with me. I don't get it why talk to me after I left and that too when you have someone else in your life. I didn't like that situation so I left her again.

Why would she do that?
How long would you wait to be in dating market?
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