When I asked him about it he said it must have been there for a while. 

I am usually at his house every night but the past week I was gone twice. One of the nights I wasn't with him I tried calling him but he said he couldn't answer because his phone was about to die and he didn't have his charger. When I went to his house the next day I found out he did have his charger and a peice of paper we had doodled my name on and a bunch of hearts on that was always on his desk was hidden under a pile of papers. And now this. 

He is adamant that he hasn't cheated but I feel so uneasy about the whole situation.