how should I say?
1. It was pretty much ten years ago, when I was still at college. I bought my girlfriend a box of chocolate for her birthday, which burned a hole in my pocket.
Or should I say,
2. I bought my girlfriend a box of chocolate, which burn a hole in my pocket, for her birthday.
Of course, the chocolate I bought was expensive for me at the time. which sentence is more suitable for everyday spoken English.