When ex starts dating
The longer they’re in the relationship, the more you lose hope.
She still can’t let go of the empty feeling when she is alone.
Again, it’s not a surefire way of telling whether or not it’s a rebound.
Some people jump from one relationship to another without waiting at all.
If they’ve been in the relationship for a few months or less, then it’s probably a rebound and it will end soon.
On the other hand, if their relationship has been going on for over a year, then you can safely assume that the relationship is serious for them and it’s probably not a rebound.