Why did my friend block me on Instagram?

[curvedspoon978]

Her and I have been very close friends for about nine months now. You ever get those friends who you immediately get a bond with and feel like you've been friends forever? This is her and I. In short, started out as a thing, held it to just friends, been pretty much inseparable (see her once or twice every week or so) since summer time. Got a IG few months back, followed her she didn't re-follow, talked to her acting dumb said 'hey, you aren't following me!' so she did. Went to check today see if she had any new photos, and it says I am not following her and when I hit the follow button it says 'requested' for like a second and goes back to the blue tab again saying 'follow.' Why would she block me? I don't think I've done anything wrong, we're like best friends, so I don't understand why she would. Her boyfriend absolutely hates me though so maybe it was him or she didn't want me to see her and him or something. I just don't understand why she'd block me. It sounds dumb since it's just IG but I'm pretty upset about it