I would have been happier if he’d just asked me to get married with no ring, then gone out together to choose something. Like UK-bee says, if you’ve already discussed getting married, talked about when it should be, etc., then getting proposed to is no big deal.
With both my fiances (yes, I’ve had two!), we talked about getting married first, went to the store, picked out the ring I liked, purchased it, then I waited for the”proposal”. There was no big surprise. I’m betting if you asked people, 95% would say that they knew a proposal was coming soon – maybe they didn’t know the exact time – but it’s never a big surprise as in “Wow – we never even discussed marriage! We’ve only been dating a few months, I just met his family, everything has been going really well, and then suddenly on Friday night we went to the movies, and we bought a large popcorn to share. In the bag was a little box. I pulled it out and opened it to find a ring. I looked up, and my Darling Husband was on bended knee, asking me to marry him. The whole crowd at the theatre clapped for us!“
Now that he’s already bought the Promise Ring, you’re kind of stuck. Maybe you will be lucky and will be able to trade in the ring for an upgraded engagement ring. I know some companies will sell you a diamond,and put it in a ‘holder’ – so the guy is proposing with the diamond, but you get to choose the exact setting you want later. At least then you always have you “engagement diamond” for sentimental purposes.
One other idea would be to take the diamond (or whatever stones are in the promise ring) and either include them somehow in your wedding set; or save for a later date, when you have kids. Then you could have a “family ring” made – including the stone from your Promise ring, as well as the birthstones of your children, and make it into a sentimental family ring you can wear to symbolize your whole marriage / family.
No matter what, at this point he’s purchased the Promise ring, so you’re getting it. At least he was nice enough to think that you should be included in purchasing your engagement ring – and you’ll be able to choose the one you want. At least be happy about that! If you don’t have anything to show to people at first, that’s ok – you can always say it’s in being re-sized.