That got cold behavior literally gets your brain addicted. You start to seek the dopamine hit of getting that attention and not regard the ultimate pit you’ll fall into when they withhold attention. The best advice I can offer as I get older is that you have to move on cuz the best revenge is not needing them at all. Immerse yourself into other dating options or friends. Don’t let this guy string you along like a junkie - you deserve real consistent attention.