In my opinion, friendships where the affection level are exactly the same for both persons are not as common as we think, even for NTs.
Despite the fact that NTs usually have relationships with a lot of persons at the same time, from what i can understand, only a few (or sometimes even none) of them can be considered true friendship.
I think we autistics have less of that "middle ground" and or we see people as true friends or we see just another person that we are not connected in any way. At least i see things this way, and for me that's one of the reasons we can feel lonely when we don't have that person who is absolutely close (or what we would call friend).
I'm sorry that you are feeling this way, but there are chances that eventually you will find another person that you can call friend again and feel that the other person feel the same way.