Should I quit inviting this "friend" to different things?

There is a coworker who left and we said we would keep in touch. Whenever I try to organize a get together (usually with other coworkers), he says "Yeah I'm down for that!" Then the day that we do go out, he cancels at the last minute due to being "Tired" from work. He then keeps saying "We will get together, I promise!"

Just yesterday we were meeting up at a bar in his neighborhood, so naturally I texted and asked if he wanted to come since we were going to be in his neighborhood. He said he accidentally left his phone in his car so couldn't check it all day but "wishes" he would had known we were meeting up. People were telling me "Likely story..." but I still like to assume the best intentions and give him the benefit of the doubt.

Should I just stop inviting him to different things? It could be a sign he's genuinely not interested, but maybe he's also genuinely tired. What would you do?