Not to get your hopes up but it happened to me twice.
Both times I thought I was fucking going to die.
The second time I got really messed up and contemplated a few unpleasant things for myself but ultimately it was all about her needing to clear a few things in her head and realize that what she had didn't come easily (something she couldn't have understood since I was her 1st). that coupled with her older sisters trying to live their youth vicariously thru her and telling her she needed to be alone and have her own place and experience and what not. She soon came back after a few unpleasant dating experiences and a few years later we married.
6 years this September and 11 years being with her except for that bit around the 4 1/2 year mark.
The 1st one though was a real wack job but this time I was the one who was too inexperienced to know better.
Only time will tell one way or another. For waht it's worth though, time heals all wounds although it sure doesn't feel lkke it at the time.