How do I help my fifteen year old son get through his first heartbreak?

He really likes this girl and has been talking about her for awhile. He asked her out last Thursday. She said yes (for this Friday) and then said she couldn’t on Monday. He was excited all weekend and now is naturally bummed. (This is the first time he’s asked a girl out.)

We talked about it some and he seems to be doing better today. I’m sure there will be more and this is comparably mild to what may happen in the future… What do I say/do when the first big heartbreak happens?

I’m wondering if any guys (or moms who have been through this with their son) remember the first crush and heartbreak and if there was something someone did or said that really helped you through it.