<human>: Summarize the given text in a few sentences.

Won't go into too much detail, but I would really love to hear those of you who have been in long term relationships - gone through the honeymoon stage, been through the ups and downs, but are still sure the relationship is right for them. My SO and I will be hitting 3 years this summer (both 27 years old), and sometimes I step back and wonder if it's the best thing for me. How do you know? I always hear people saying things like "after the honeymoon/butterfly phase wears off, to love each other is a choice," but what really does this mean? Do those of you in successful LTR's wake up each day and CHOOSE to love that person, or are there still foundations of that "crazy about them" feeling? How do you overcome your doubts?
<bot>: Not sure if this relationship is right for me because of the doubts; how do LTR redditors overcome their doubts and create a fulfilling relationship