So... I'm doing laundry right now and I just found a girls shirt that IS NOT mine in my SO and I's laundry.

I texted him a picture of it and asked who's it is and he won't respond. What do I do??

UPDATE:

I contacted a friend of mine that lives with us and asked if it actually was the girls shirt that always stays over at our place with him and he 100% confirmed that it is hers because he has done her laundry a number of times.

Therefore, my boyfriend was not lying because he said that there was a possibility of her clothes getting mixed up with ours from accidentally leaving a clothing item in the wash or dryer and me doing laundry immediately afterwards.

Glad I was able to clear this up before I did any damage to our relationship. (: