Although it means 'at all times' or 'on all occasions', it has a special meaning to the "Harry Potter" fandom or "Potterheads". It is a word that is famous for Professor Severus Snape (The Half Blood Prince) who used it to state his love for Harry's mother Lily when Dumbledor asked him about his 'patronus'. Now it's widely used among the "Potterheads" to show their dedication towards something.

Bullshit nothing is ever always we are forever changing and nothing is ever the same

It's a state where something occurs all the time, non-stop. It never ends, neither it ever starts.
It could also repeat itself through the time, forever.

Related: forever repeat