Did she send the photo on purpose?

“My friend recently told me my girlfriend sent him a topless photo on snapchat.
When I asked her about it, she said she meant to send it to me and must have sent it to him by mistake since our names both start with the same letter. The thing is, she hasn’t sent me a photo like that since we first started dating.
I don’t think she’d cheat on me, but this makes me a little uncomfortable. What do you think?”
What do you think?