When they were dating her mother who she was very close to had died. She took it very bad. Something else happened, I forgot what, and she kind of shut down and simply said "I just can't do this right now" not much further explanation and that was it. So, he spun out over it, got pretty depressed over it and is coming back around
So - the only red flag here for me is, the part where he spun out over it and got pretty depressed.
I mean - I get it, you've invested time in a relationship and thought it was going somewhere and then it fizzles. Very disappointing. But if the way he handles adversity is to spin out and get depressed - that worries me a bit.
Also - she was grieving the loss of her mother and shut him out. An adult who truly loved that person might reasonably look at the situation and say "She's really hurting, I should just stand back and offer her support and make no demands on her until she feels better."
Now, maybe he did that, and maybe she's just the dating equivalent of a WAW who went into the MLC rabbit hole once her mom died. You'll just have to keep your ears open for more clues.
