Should I say something to him about this?

My boyfriend and I live together. He was on the phone in the other room but I walked past and heard a part of the conversation. I never mind him being on the phone. He has close friends, a mom and sisters. I’m not insecure but today was different because of what I heard him say over the phone. He wasn’t loud but I still heard him. I don’t have full context of the conversation but he said “I know I have a girlfriend but you still have a place in my heart.” Which makes me believe he wasn’t on the phone with one of his sisters or mom. I want to say something but I don’t know how to approach him about it without coming off as being the girlfriend who listens to his conversations. I could also be overthinking it.

Should I say something to him about this?
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