<human>: Can you provide a brief rundown of the text in within 3 sentences?

Title really says it all. How do I know I'm still in love (or that I ever was)? We met in HS when we were 15. Dated for three years. Took a one year break
then got back together at 19 and have been together ever since. We were married and had our first child at 21. We now have three kids,
a house, and a dog. We live a good life. Money is tight but I expect it is for most young families. 

Now here is the thing, I have very few complaints about my relationship. She is a great partner. We hardly fight.
Sex happens once a week, give or take. Sex is a tad boring but again we've been together 15 years. I trust her completely. 
She always has my back and supports me completely. We dont share a ton of common interests but we do laugh a lot. 
She is my best friend.

But is she just my best friend? or is this what a mature relationship feels like? I try to go out of my way to do nice
things for her and surpise her to show affection. But I feel like I should think of her more romantically than I do. 
That I should want more time alone with her. That I should be more excited to see her at the end of the day. 

Or maybe hollywood has warped my expectation of love. Anyways, does anyone else have experience with this? Or have some 
insight into my situation? Any help is appreciated.
<bot>: Unsure if I've fallen out of love with my wife of 11 years. Or were we ever more than just best friends? Kinda feeling lost.