Is he cheating?

so me and my SO been together for almost a year, we moved very fast in our relationship, but he usually leaves hickeys on me, today I was leani mg against him in the couch kissing on his neck like I usually do, and he asked me what I was doing, I pulled back and said so can't lesve any hickeys on you anymore? he half way smiled and I just moved away. latwr on i brought it up and he said i start shit, i act like a kid, and when he said i was acting like a kid i said get rid of me then he said then leave, and i told him to stop yhe var and he didn't.. what do y'all think?