How do I (or should I even bother to?) get the money my exboyfriend owes me?

My ex and I broke up last March. He moved away in May (he had moved here to be with me). I had plenty of storage space, and he didn’t have living arrangements where he was going, so he left some stuff with me for storage. We parted on very amicable terms.

He moved, met someone else, and more or less cut off contact with me. I mailed the stuff he left with me to his parents’ house. It was about $80. He has said repeatedly that he would pay me back, but he has not done so yet, and I know that money is very tight for him.

However, I also know that his girlfriend lives more than 200 miles away and he routinely sees her. I cannot imagine this happens for free.

So I am assuming that he is choosing to spend his money to see her rather than to pay me back. I find this fucking offensive.

Am I being unreasonable? Do I call him up and put my foot down and demand he pay me back immediately? Or should I just sit here (like a fucking chump) and wait for him to pay me back…?