What do I do if someone keeps leaving me on delivered/seen?

I'm always the one double texting. First, he left me on seen for 3 days. I double texted on the third day. He responded right away saying he was busy. Second time, he left me on delivered. It's been a month. Should i double text again wishing him a happy holiday? I feel like he's not interested in talking to me though. Should I completely stop texting him? Or send him one last text saying "I'm no longer interested in talking to someone who's clearly not interested in me. It was nice getting to know you though. Have a good holiday"? Lol
What do I do if someone keeps leaving me on delivered/seen?
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