I know the right answer is probably after one of you asks the other out. But I've talked to this gal for a month off Tinder and we finally met up a few days ago. I happen to pull up my Tinder for the first time in 1-2 weeks only to see that it shows she's online. We've really hit it off and been doing some flirting and talking about our future, but I'm honestly surprised to see her online. Unless she's checking in to see if I'm ever online.