I think my boyfriend is cheating

So guys I went on a girls trip to Atlanta for the weekend and pretty much kept in touch with my boyfriend the whole time. Saturday he decides that he’s going out with his guy friends .. cool that’s fine with me. Sunday afternoon I return as I’m setting down my luggage by the dresser stand I see a small bottle of foundation. I know for a fact wasn’t there before I left and also isn’t a brand I use or my shade. I instantly confront him about it and he denies everything and says it’s mine I’m tripping, nobody was at the house. And he doesn’t know where it came from. Mind you I know this dresser it’s usually very empty. Before I left I cleaned it and stuff nicely. So it just had to have got there. I’m so disappointed he’s lying to me about it. What should I do? I’m positive it’s not mine like 120% positive.