Well, I have my Boyfriend who I do a lot with. He is smart, sweet, adventurous, cute (to me), irritating, repetitive, and sometimes speaks before thinking . But I love all these qualities about him even if he drives me up a wall sometimes. We’ve been together for 2.5 years.
I also have my best friends who live all over the country/world from me. But no matter the distance, we can meet up and it will be like we’d never been separated. I’ve known one of my best friends since she was born (our parents were childhood friends), I’ve know another since I was 3 (we are now 29). And I’ve known my very best friend for 10 years and my other very best friend for 6.
They’re all wildly different and I love them all dearly.
I think the best thing you can do about your doubts is have a mature conversation about those doubts with your partner. Let her know you’ve had some worries lately and ask her if there is a reason she acts differently toward you sometimes. The key to maintaining healthy relationships is being able to communicate to one another. It’s the only way you will know what the other is thinking/how the other is feeling.