Are girls generally heartless or does it depend on the girl in question? There is à reason behind it which is written below.

A guy happened to lose the contact of his girlfriend who lives thousands of KM away. After few weeks of no contact, the girl decided to call her boyfriend. She did and after exchanging their love greetings, the guy apologised for the loss of contact. Both made up and became tighter lovers.

However, few weeks later, the guy lost his mum and that kinda messed up his brain. He wasn't able to call the girlfriend for two days since he was greatly affected by the loss. When he finally called, he apologised and opened up to her, telling her about her mum' s death. Rather than consoling the boyfriend, she was not bothered about the boyfriend's loss and cared all about the guy keeping regular check on her. In addition, they planned getting married as soon as they are capable of being parents. Now, the question now is,
1. should the guy go ahead the marriage plan?
2. Are all girls normally this way or is it personal?
3. If the guy cancels the marriage plan, should he completely turn his back on her or keep her around as à girlfriend?

NB. This is real life story and i would love sincere answers.