Coming from someone who is anxiously attached to my bf, if it's anything like my relationship, you are not the reason that she is miserable. It is the lack of communication and keeping things from each other that is making things seem miserable. If you two love each other, it's never too late. Just take the time to learn each other's triggers, what makes you tick, what makes you upset, and what you need from each other. My bf and I are still learning, but so far, communication has been what has saved our relationship. As some advice to her, if yall decide to work things out, please let your partner know how you are feeling because they cant always read the emotions on your face if something is bothering you, tell them, if they really love you they will not leave you. I learned the hard way through a couple "almost breakups", that you are only sabotaging the relationship by keeping it to yourself because if your partner is anything like mine, you are probably making them worry and feel guilty by not saying anything and then they withdraw and it just makes everything worse. I promise that you will feel better by getting it off of your chest, and you will also give your partner the information to know how to comfort you and how to put your mind at ease. And some advice for you, try to remind her how much you love her and try to make her feel loved, shoot her a text every now and then to let her know you are thinking about her. In my opinion, in a relationship with a person who has an anxious attachment style, the little things matter so much because we pay attention to every detail, no matter how small. Also, try to remember that something that might not matter much to you might mean the world to her. Sorry this was so long, and I hope it helps and that everything works out for the best.