In the words of Liam Payne, to me, "you're insecure, don't know what for", but to you, there are a multitude of reasons that have built up over the years that give you every right in the world to be reserved, hold your cards close to your chest, protect your heart, and second guess every compliment anyone's ever gave you.
Guys have put you on a pedestal and made you feel like you're everything just to ghost you, dated you for a year and a half, professed his love for you everyday, all the while he was cheating behind your back and felt absolutely zero shame in the process, your upbringing, the way you're catcalled at by strangers on the street like a piece of meat, the way society has made you feel like you're only capable of ever coming second place.
There are countless reasons why any woman in this world could develop a sense that she'll never be good enough.
Refuse to be one of those reasons.
The most important thing you can possibly do for someone who is insecure is be patient. Whether that's in having a conversation multiple times to help them understand why you did something, never raising your voice and always showing them respect in arguments, or continuing to give them compliments and hyping them up even when they don't believe you or tell you to stop. Be an open book about anything and everything for them, and their trust and faith in you will gradually increase over time.
Essentially, at the root of the problem for most who are plagued by constant insecurities is the fear of being left or abandoned.
Maybe to me, my past doesn't matter. I've moved on, I'm at peace with the mistakes I've made, grown from them, and I'm ready to be a better person because of them, but to you, my past is terrifying. Its a constant comparison with yourself and someone else, a mindless spiral into the dark suspicions of your mind that can place severe doubt in someone you're so deeply and incredibly devoted to.
If this sounds like your significant other, know that it is not a reflection on their trust in you. They aren't trying to accuse you of anything, it's just extremely difficult for them to give all of themselves to you, without any remissions, knowing what is capable of happening and the immense pain that could be brought to them in the process.
Show them every day that it won't.
On days when the weight of the world is on her shoulders and she feels like the sky and all its weight crashing down on her, you have the ability to lend a hand so life doesn't seem so impossible.
Do so. Everyday.
If you take the time and enjoy the process, you'll be absolutely enamored by the response she gives you.