The #1 killer of relationships is having unrealistic expectations.

 
You think it’s supposed to be easier than it actually is. It started out one way and now it’s different.
It’s important to realize that relationships start off as passionate love. That’s what gives you the attraction. But, eventually, when you look at those old people holding hands while they’re walking down the road, it turns into compassionate love. And that’s different. That’s your best friend, your partner.
When you expect the relationship to be amazing, you’re setting yourself up for disappointment, because relationships evolve over time. Being able to embrace the beauty in the compassionate love, and the beauty in the peace, the ease of it, is better than trying to hold on to something that’s already gone.