WIBTA if I unfollowed my “best friend”

For starters we have been friends since primary school, up until our early twenties(now) and use to talk every day up until about 2 years ago. They are also my only friend. I’m not a real social person so I don’t make a lot of friends easily. We currently live in different cities so seeing eachother often is hard to schedule. Before I moved away we lived close by, even then seeing them was a struggle. They just aren’t the best at replying sometimes.

Anyway I moved about a year ago now to a different city a couple hours away and we would periodically talk. I send updates every week and get a reply maybe 1-2 times ever 3 months when something happens in their life. Usually when they need advice or something.

I expressed that I felt the relationship was very one sided and could use a bit more effort in keeping in touch. And they were very understanding and very supportive of wanting this friendship to not just work but flourish. I understand we’re both living different lives and so I wanted to just express how important it was for me to feel connected to them still. Anyway it’s been about 2 months since this and I haven’t heard anything. I sent them messages and updates. I even asked if they were available for a call but heard nothing.

I’m not super upset but would I be the asshole if I unfollowed someone who very clearly doesn’t have the time to maintain this friendship now? Is that petty of me? I just don’t think it’s necessary to keep giving them my time and energy when for a year it’s been very one sided.