<human>: Can you provide a brief rundown of the text in within 3 sentences?

My boyfriend bought a necklace for another girl and I just don't know how I feel about it.

I was clicking about on his amazon account at the weekend (NOT behind his back, I hasten to add. He'd asked me to help him figure something out so I was clicking about to see if I could), and I saw a nice silver necklace in his purchasing history from about 6 weeks ago. I asked who he was buying jewellery for and he said for [friend] for her birthday. At the time I just kinda said oh ok and moved on. But I'm not sure if it is ok. Or if it totally is ok, and I'm just being ridiculous.

On one hand it shouldn't matter. He loves me and I know he does and I'm 99% sure there is nothing going on with him and this other girl. They are friends and have been for a while and he just wanted to get her something nice for her birthday. Which is cool, and I'm imagining is exactly the way he thought about it. He's super kind and thoughtful.

On the other hand...I don't know. I just don't like it. I think it's weird to buy jewellery for someone who's not your SO. Is this just me? I also think its weird that he didn't mention it, and still probably wouldn't have if I hadn't seen it. While I know there's nothing going on with them more than friendship I have had my niggling doubts now and then about her. But I don't want to be one of those girlfriends, so I just keep them to myself. I don't know what it is. 

But I feel there's probably no point in bringing it up with him. Especially as it was a couple of days ago I found out, I feel it's too late to bring it up. And I don't know if I have reason to be not cool with it or if I'm just being stupid. We have other things kind of going on with us just now (nothing major, just changes throwing us out a bit) and I feel like I'm maybe just dwelling on it because a lot of things are up in the air. I don't know.
<bot>: my boyfriend bought another girl a necklace for her birthday and I'm not sure if I'm cool with it. Or if I should be.