they all melt into one,.?
The context is like this: This man and his gf were on the way to his classmate's wedding, while they were talking about who'd attend the wedding as well.. and then they mentioned the man's ex would also be there.
This man explained to his gf that that girl was not actually his ex.,, just old friend. but they fell out for a while, and since then, they hadn't seen each other for years.
so his gf said to him : " They all melt into one, so did you have a thing with her ? "
Now, I have two questions about the text.
One is what did the woman refer to "they" that all melt into one ?
Two is "did you have a thing with her" , is it the same as " did you have anything to do with her in the past ?"
thanks for your answer