sometimes it's not intentionally spiteful to unlike something, just a slip of the finger. shouldn't be beholden to a missed click.
I am sure some people have unfollowed me, but I don’t check enough to even know. I have unfollowed people due to inactivity though
I think you can check out a feed or something that shows activity of the people you follow I think I just look at it like friends on other stuff.
I believe it allows you to access a person’s profile, if they have so chosen to make their profile accessible only on following that user. I may be incorrect, ofc Edit: strictly speaking about follows on the JC