Girlfriend is worried

[nobody important]

As the title suggests my girlfriend is always worried that I am:
A) going to get bored with her and find another girl
B) start talking to another girl
C) cheat on her
D) other
Now I understand being worried about losing someone, she has plenty of guys who want to be with her and I truly would be crushed if she cheated on me, but I trust she will stay faithful. I have tried reassuring her by telling her she is perfect for me (the truth), I could never get bored of her (also true), and that I could never cheat on someone, let alone her (most true). But the worrying persists. I'm just wondering what I else I could do to reassure her.

Thank you for your time!

[Legion]

This is simple, my friend. She has very low self-esteem. The fact that she believes that you will find better than her shows that she does not think highly of herself. I'm not saying one should believe they are the best partner in the world. But one should believe they are the best match for the other person, or they will lose faith in the match. Also, she seems to have greater trust issues, the kind which you seem to not suffer from in the least.

Sadly, there is not much you can do. I've dealt with this sort of thing before, and well, we are no longer together because of it. It can get rather tiring to have to reassure every five minutes that you will not leave your partner. You may have to start considering that she may not change. Apologies.

Cheer up, mate. Hang in there. Who knows, she may come around. Or you will get so fed up with it that you'll be ready to move on to someone with a bit more self-image. Your call. In any case, I hope I assisted even a little. Best of luck, friend.

[Acheron]

Controversial opinion time. This is a good thing. A little jealousy is the difference between an apathetic, expanding girlfriend and an attentive, spontaneous-blowjob-giving girlfriend. A girlfriend who sees no threats to her position can and will sit back, relax, and let you wait on her hand and foot. I get the impression you'd do that. In fact, the only problem is that she keeps bugging you. Telling her how perfect and wonderful she is every time she voices her insecurities only encourages her. Instead, blow her off. Tell her she's being stupid. Because she is. You don't seem like the cheating type. She'll keep worrying, because that's just what girls do, but she'll worry in glorious silence.

[Smitten]

To add to the above, this is her issue - not yours.
Her low self-worth makes her feel like she isn't good enough for you and that you will find someone better.
There is nothing you can do about it, only she can resolve this within herself.

[nobody important]

Alrighty, I have always tried to fix everything, but I need to let this resolve itself. Thank you all for the help!