The impression I get is that teal and grey have been hooking up casually for a while and have been open in their discussions about actively looking for other people. Teal’s “thank god” is a call back to grey’s consistent difficulty finding s suitible partner or complaints about being unable to find one. Grey then responds with faux outrage.

I’ve had these sorts of message back and forth with fwbs before, but even meaner. They’re hilarious