Found a tampon in his apartment, when should I leave?

I slept over at my bf’s place and saw that there was a tampon in the trash. I asked him about it and he said his roommate has been bringing girls home. He also followed up and said “i swear baby there is no other girls. Its just you.”

when i came over he pulled out the sheets from the washer to put them on. I know it can be true that it belongs to one of the girls that the roommate brought home but im also aware of the tampon and washing sheets relation.

am I overthinking this?

Updates
+1 y
The girl that his roommate brought home was someone from work. I have been to his workplace for meals and my boyfriend will come over to say hi and gives me kisses on my forehead. So I’m sure his coworkers know that we’re together.
Found a tampon in his apartment, when should I leave?
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