<human>: Hi there reddit. this whole situatation has made me lose a lot of sleep and I need some advice.

So basically, the situation here is that I want a relationship with this girl. We're both (I think) exclusive, kiss fairly regularly and have sex every now and then. For reasons of hers, she's very untrusting of guys and has been hurt in the past.

Last night probably the worst situation possible aligns. The day prior, I was alone in my room. I live in a quadplex (apartment style house) for school and usually leave the back door open if people want to stop by and say hello. So my neighbour comes over and asks if I can give my opinion on something to wear out to the bar. I say sure, and she goes back to her place. She comes back with all her clothes and says she'll get started. (I should preface that she's very forward and open coming for whatever reason) I say what the fuck, and step outside my roomm and let her change. Alright I guess, while she changes I'll just leave the room. So I give her the thumbs up on an outfit and she leaves with (what I assumed) all of her clothes. Apparently she forget to grab one of her bras from the floor. My floor has been kind of messy lately so I didn't notice.

Fast forward to last night, I had gone to work and come back with SO. We get ready to put on a movie and relax after the day, and she finds the bra on the floor. Of course this looks terrible on me as it looks like I had been with someone else and forgot to clean up after myself. I've of course explained the situation, but I don't think she believes me. She went home shortly after without staying the night as we had planned to do.

Now I really like this girl and would love nothing more than to be in an actual relationship with her. She's my best friend and I'd do anything for her but I feel that irreparable damage may have been done.

Is there anything that I can do to help her believe me or at least try to fix this?

:(

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: SO found another woman's bra on the floor in my room, and assumes the worst. In actuality, it's just been a terrible sequence of events