Looked the notifications on my bfs phone and saw a snap from a woman?

I have been in a relationship for 4 years now and we live together. He knows my password but I don't his and something inside me told me to look into the notifications and I saw this snap avatar of a orange haired woman and it's stuck in my head, who is she and all. I don't know how to ask him about it bc I know he values his privacy but I also value my own time in this relationship so what do u Belive? He doesn't have female friends soo
Looked the notifications on my bfs phone and saw a snap from a woman?
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