How do I make this up to Spamuell?

[partygirluk]

Arranged to meet him at the cinema at 18:55. I didn't turn up until 19:45, by which time he had left. This was due some unfortunate happenings, but ultimately is my fault. My phone wasnt charged so I couldnt contact him. So he had to wait on his own, in the cinema foyer for 45 minutes with no idea wtf was happening. I feel so incredibly terrible at the moment, and really want to make this up to him. However, I don't know how you make this up - I took 50 minutes of his time, I can't just buy him 50 minutes of life.

What is the apposite thing to do?