Could he be cheating on me?

32 f 30 m we have been together for 3 months and is my best relationship I have had. We are like best friends aswell as boyfriend and girlfriend. I have never had no reason not to trust him and can talk to him about anything.

I went to his house the other day and noticed a hair clip that wasn’t mine, this was a big hair clip so it wasn’t like a Bobby pin I’ve forgotten about. I said to him whose hair clip is that? It was on his kitchen table, he said he didn’t know who’s it was the only people that have been over are his mom, his 2 friends girlfriends (who I’m friends with) they were there 2 weekends ago. He said he had been cleaning so he must of just put it on the side, he looked me in my eyes and promised me he would never cheat on me and asked me if I honestly thought we would. I told him if he wants to be unfaithful and ruin what we have then he would be a fool and he said I know and I hope you know you don’t need to tell me that. I’m at his house a lot and have only seen this clip the other day so it has recently been there. It’s made me feel a little uneasy, do you think he could be cheating on me?

Could he be cheating on me?
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