Why would he leave me over this?

So this guy I was dating for two months , we clicked extremely well off the back!!! Anyways background info , he's got cheated on in the past and so have I.. he unfortunately was still very insecure.. so when we were together he would see guys hit me up and he would see me tell them "I'm talking to someone" or sometimes I wouldn't even reply to them... so long story short he said he's "playing my game" now.. which I'm not playing any games and I tried to tell him... so he basically cut me off because guys would hit me up... but I was so faithful... it sucks because I gave him 100% effort and for him to just cut me off like that? ... and he post stuff that makes it seem like I' cheated on him.. it sucks kuz I miss him so much.. we haven't talked in 3 days.. but it's been a total off a week and a day since we've been together.. what do I do?
Why would he leave me over this?
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