Hello! Do you think love can be eternal or is it all fairy tales and myths?

May be. But in real life I have never met a love that would last a lifetime.

I fully believe that to be successful, relationships need to be worked on. And so I suggest you read the article https://www.female.com.au/6-ways-to-make-love-last-forever.htm about how to extend your love forever. Of course, this is very serious moral work on relationships, and if you are not ready to work, then you simply do not love the person who is next to you in a relationship.