Last time I went through this was college... when dinosaurs ruled the earth.
Girl I had asked to marry me - dumped me... after I drove 14 hours home to see her... had just given her an expensive gift... on Christmas Eve. Man that sucked!
I moped for three days... tried to win her back... wrote her a card and left it on her car. No response.
I was ticked... decided to ask out a girl I had known for years that liked me. We saw each other every day until I went back to school.
Started dating another girl when I got back to school... and I have been married to her for over 26 years.
I am so glad that the relationship with the first girl ended when it did - or the timing would not have been right otherwise. Hurt at the time, but not for too long.
If your old girlfriend wants to spend her life with you, she will figure it out. But if she really isn't sure... then you are better off to find out now. Hurts now - but would hurt even more later if you had gotten even deeper involved.
Praying for you, Mark. You have much to look forward to!