I am not a good guy

I say I love her
But all I seem to do is hurt her
How can I let myself do this
I am trying to help telling her what I think
But it is not helping she is full of doubt now
She needs to decide on her own what too do
And that is hard enough as it is
She believes him and trust him
That should be enough but the feeling I get is horrible
I do not want her to get hurt I want to keep her safe
But I have just complicated every thing and hurt her and me
She says he is a good guy but I do not see that
He hurt her to many times for me to think that
But what have I done I am no better
The doubt and worry that she now feels is pain
And its so much worse knowing I have caused it
Even if others think I am a good guy I am not
If I was I would not interfere I would just be there for her
But that is not what I do I let my feeling cloud my judgment
And when I hurt her or feel that she is in danger the cloud grows even more
So now I am the one confused not knowing what to do
Should I leave her so that I do not hurt her or stay which is likely of more comfort to me