Penis tastes like he had sex or just sweat?

Idk about yall intuition is always what i go with. But ive been wrong before. Before i go accusing my bf of cheating. He came over last night and when we hooked up the first thing that happened was i went down on him. And i swear yall it tasted like you know after ya have already had sex a bit and then go down like a little like a vagina 😭😩 but idk maybe he was just sweaty?!! 😩😩😩 opinions please