"Yes I’m hoping his son will be a grown up."
I am cringing that you are going to contact his son to complain about him. I am sure that he will, by now, have heard his dad's interpretation of events and this will just make you look even nuttier.
"Why should I be expected to just ‘move on’ and act like it doesn’t matter?!"
To maintain your dignity. He has ignored you so that is your answer. He doesn't want to attend the concert with you and will be aware of the value of the ticket. You're more likely to get somewhere if you ask for the money back imo, although, if he paid for his ticket to the second concert, he might see it as a straight swap.
"As he had booked and paid for it only he could book it, change it or amend it so I told him to let his son have it."
Apologies. I missed that.
"Is this something that’s gappened to you."
No. If I break up with someone I get what is mine right then because I know that, once I've gone, I'll never want to contact or attend an event with him again.
I wouldn't be contacting him to state the blindingly obvious 'I won't be going out with you on valentines day' or to lower myself to grovelling for something.
You still have the tickets to the second concert don't you? Just call it quits. Or keep pestering him and his family I guess, up to you.