Boyfriend Saw Another Girl’s Nudes

My boyfriend and I are in a long distance relationship. Today I woke up to to a message of him telling me a girl on his snapchat had uploaded her nudes onto her story and that he saw it. At first I felt jealousy (not his fault at all), but after thinking about it, he told me about it when he didn’t have to. That’s a good thing, right? We’re both 20 and I have never disclosed that I wanted these things shared with me. He told me because he wanted to. How should I be feeling?