Every relationship will get "boring" after you've been together for years. Love isn't a feeling. It's a commitment to love every day, physically and emotionally. It's difficult, it's not always laughs, smiles and fun. People tend to quit when it stops being fun, and they go look for someone else, because "the spark is gone".
No, that's not how it works. You want somebody to never give up on you, and love you unconditionally then do the same. Be the change. This isn't Hollywood, this isn't the movies. That shit isn't real. Love someone when you don't want to. When they aren't the easiest to deal with. When they're hard to love.
That's the realist shit there is💯