When I was young, my first girlfriend wanted to open up our relationship before she went to college, what exactly did that mean?

So when I was 18/19 I've been seeing this girl for a year, and we were friends for many years before that

We were both only really experienced with eachother, and she suggested we open up our relationship when she went to college (I went later)

Did this mean she didn't like me? At the time I wasn't very secure so this bothered me a lot and eventually ruined our relationship, but now I have different thoughts about it, being more mature, and I could see maybe she just wanted more experience

When I was young, my first girlfriend wanted to open up our relationship before she went to college, what exactly did that mean?
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