My (28F) husband (33M) bought a vibrator for his female best friend & I feel a line was crossed

My husband and his female best friend are quite close, and they talk about everything. It's never really bothered me much. However, I found out recently that she asked for a vibrator as her birthday present, and he bought her one. Moreover, when I asked him on the day of what the present was, he refused to tell me saying it was "private", and he needed to check with his best friend first before telling me. This pissed me off a bit at first, and then when I found out what the present was I really felt like a line was crossed. I've explained to him that I thought it was very inappropriate that he didn't even ask me first. His defense has been that he thought society needs to normalise self-love, and so he didn't feel it was an inappropriate thing.

He feels bad when he realised how hurt I was & has apologized profusely. I believe his intentions were genuine. But I'm still quite mad at him.

I should note, they're both absolutely not interested in each other sexually in any way, so not worried about that at all. Just very livid at him & feel my privacy was violated a bit. Am I overreacting? How do I come around to forgiving him?