I just don’t understand that?

I gave this guy a chance because he kept telling me how much he liked me and stuff so I finally gave him a chance. We did something we still kept talking after that. But I started to notice he start acting like he don’t see my calls or messages. He than stopped putting effort like he was doing to get me but once I stop writing him and calling he always than come around and try putting effort like he was doing in the beginning. I’ll give it another try and he would go back to making me feel ugly and worthless again by doing the same thing again.
I just don’t understand that?
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