Sometimes people here may disconnect from bloggers they once followed (for a variety of reasons, like loss of interest or whatever). However, if it seems you’ve lost a follower, that may not be any fault of yours in some cases at all. It’s sometimes possible that spam accounts (fake ones) could get purged from WordPress.
Also, genuine users may at times simply choose to abandon the platform, and if they do, THAT’S another reason they might disappear from your connections.
My point, is don’t jump to a conclusion if you lose a follower here, don’t dwell on it too hard or beat yourself up for something that might not even have anything to do with you personally.
If you do think you’ve lost a connection you’ve gotten to know well b/c of something you said or did to them personally, maybe write to them and request (never hostilely demand) that they talk it out with you. You may find them open to that. If they are not, don’t harass them, just let it go.