The gal gave you a very practical gift. Plus, from the engraving, it shows she cares about you and your welfare. Work through your emotional baggage and then enjoy the gift.
I wish I still had some of the gifts given to me by ex-girlfriends and my two ex-wives. Like I said before, there will be a time that the engraving won't be a big deal. With a little time, it might even bring a smile to your face.