Or perhaps the OP asked her BF why his friend why she (the friend) didn't seem to like her, and the BF told her that the friend doesn't think she (the OP) is good enough for him? (OP, it would be good if you could elaborate on this point).
Overall, I think it's a rather poor choice of wording. As PPs have pointed out, it makes it sound like the partner isn't on the same level as the other person. And by "level" I mean level of attractiveness, or popularity or education or wealth, etc. As opposed to level of character, integrity, kindness, honesty, etc.