No its not abnormal at all, you've probably thought of this nice young man as almost part of the family and you can't just turn off those feelings.
I kept in contact with my sons girlfriend because we became good friends, they both moved on to have lovely families with other people and its lovely she keeps me up to date. I guess it would be different if she were a man as he's likely to just disappear from your lives.
Your husband is right, she will get over it but its ok for you to be upset too. Don't be hard on yourself 
what is this behavior called does it have a name?
Adverts that are being shown on the tele
When a political leader lies on their CV - can you trust them?
