She’s scared you’re going to leave because that’s what she knows, that’s what’s familiar. That’s what has happened to her in the past. Love and leave. She’s been a part of that before.
She’s scared you’re going to leave because occasionally her insecurities get the best of her. Her insecurities tell her to act in ways she never would, they whisper things she thinks are true, they win the space in her head where happiness once grew and they take it over. Her insecurities are the ones telling her she’s not enough, that you’ll leave her for someone else eventually, someone who’s better for you, someone who’s better than her.
She’s scared you’re going to leave because any time something in her life seems to be going right, it suddenly goes wrong. What goes up must come down, and when things go up for her they come back down lower than where they started.
She’s scared you’re going to leave because she’s terrified of the way she’ll feel if you do. She knows it won’t be pretty. She knows it will be a type of hurt she’s never felt before because although she’s familiar with those who love and leave, each time someone does it, she feels a new kind of pain.
So if you truly love her, then do just that. Love her with all that you can, while you can.
Love her in a way that quiets her insecurities. Don’t try to silence them. Don’t question why she has them. If you truly love her, accept that they are there. Accept that sometimes they will make her say things she doesn’t mean, do things she didn’t intend to do. Accept her insecurities and love her until she makes them disappear herself.
Love her in a way that makes her know that she’s enough. That she won’t, can’t, be the only thing that matters to you, but that she’s nonetheless important. Love her in a way that shows exactly what she means to you.
Love her in a way that comforts her. That lets her know that things will sometimes go wrong, but that you’ll do what you can to make them right. Make her know that things won’t always be perfect, but that you’ll have each other when they’re not.
Love her in a way that makes her know that you’re there. That you’re there when she needs you, that you’re there for support. That you can be the person who won’t judge her when she needs someone to hear her thoughts. That you can be the person who will listen, and who might not always understand, but will try.
If you truly love her, love her in a way that makes her know you’re not like the others. The ones who hurt her. The ones who couldn’t show her the love that she deserves. The ones who couldn’t appreciate everything that she is. The ones who love only to leave.
Love her in a way that assures her that you’ll stay. That you’re not going anywhere. That the only place you plan to be is by her side. 
