What to do when you miss a person so much do he doesn’t want to talk to you?

We’ve talked off and on for a year and a half now. He’s always hot and cold some weeks he’s very present the next he will be a ghost. We are suppose to hang out next Saturday but when I mentioned it he never replied but he’s been very active on social media my heart hurts so bad because I want it to work but obviously he doesn’t care about me that much even tho he says he does I just turned 25 he’s 27
What to do when you miss a person so much do he doesn’t want to talk to you?
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