vitamin P, I think you should actually have a conversation and
find out why is it that they think that it is better to be friends
with you?
There is always this saying that some people are better off as
friends than in a r/s. You need to find out the underlying reason
why. I think 1 reason simply is because you may have been a little
bit too possessive in the r/s which of course normally as friends,
you do not show this (pardon me but this is just a little guess on
my part).
Talk to each other openly, with an open mind to accept and I
believe you will find out why end of the day.
Good luck and all the best!