Hmm, the dior is cute, but I think the Popincourt will last you longer.. I would personally get tired of the dior after a while, but the LV I could use forever and it won't go out of style. The Dior is cute though and makes more of a statement IMO. It all comes down to what you want out of the bag. When are you planning on wearing it and with what?
I actually like the Dior. When I first saw your posting, I was like wowwwwww at the picture of the Dior. The Dior looks very classy and feminine, whereas the LV is more practical and casual.
Did your bf pick out the Dior personally or did you choose it yourself? If he picked it out himself, I might just keep it considering it's coming from his heart.
I love this popincourt alot. But when comparing it with the Dior bag, the Dior one stands out better. I'd say keep the Dior. Besides, it's a V-Day pressie! That is priceless!