It’s perfectly normal to get a bit “bored” in a relationship. The spark isn’t always going to be there, and conversations will tend to drag on at times. That’s just how it works. You shouldn’t look at how to prevent these things, instead you should look at how to adapt and combat them. A relationship that’s been through a lot will arguably be a lot stronger than a relationship that hasn’t.
How can you fix it? Start off by accepting it, once you’ve accepted that your relationship is getting a bit dull, you will think with a better mindset on how to fix it. If you’re scared or upset, it’s only going to make things worse and cause you to create unnecessary scenarios in your head. Trust me, been there before. Staying calm and collected is always best.
This might not be for everyone but another thing I’ve done when my relationship was going downhill was make jokes about it. I would tell my girlfriend how boring she had gotten and she would tell me how boring I had gotten (in a jokingly manner). We would make jokes about everything that was wrong with our relationship and things just got better somehow overtime. I guess I could say, we found “the silver lining in the dark cloud.”
There are a lot of things you can do to bring the spark back. Try going out, go to the movies, take a walk in the park, get romantic. Anything that will Involve another element in your relationship.
The key is to have patience. Work through it together as a couple and I promise your relationship will come out a lot stronger in the end :)