Breakups?

Lynsey
So I had been with my ex for about 7 months. I had to go to a hospital and stay there for 7 days with no contact with him what so ever. I was in the hospital for my anorexia getting out of control. 
While I was there, another boy that was on the same floor with me kissed me. I was polite and told him I had a boyfriend and I asked for him to, in the politest way possible, back off. To which he apologies and did so. 
When I returned from the hospital I, obviously, told him. His response was that he has also cheated on me, that it "gave him joy when I was away." 
I tired to just let it go but I ended up breaking up with him because, well he cheated on me. He says that it is unfair since I cheated also. But I didn't have anything to do with the kiss, I pulled away as soon as it happened. 
So, am I the one at wrong here? I want your opinions ladies.  

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