They tend to forget to follow through on what they say that they will or will not do. Their memories are like Swiss cheese or mush. He forget or something else came up and took his focus off of what he was suppose to do.
If the texts aren't urgent or actually require a response, then don't respond. He's can't miss you if you are readily available all of the time. I would let him stew and not respond for a while, if at all. Sometimes actions speak louder than words.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
