When is it time to step away?

[Anonymous]

I have been in a relationship coming up to two years and it feels like it is struggling on an almost consistence basis. At some points it goes really well and at other times it feels like I might as well not exist. Part of me thinks I should step away, that if I am even questioning things it is a massive warning sign but I don't want to. We have spoken on a number of occasions that we do not want to break up and if anything the person has said they are waiting for me to give up. I really don't want to but I do think it is for very selfish reasons and mainly about not wanting to be alone.

I am terrified if I say what is on my mind I am going to destroy what I have and that there is no turning back, I want to believe that sooner rather than later things will improve I just need to wait it out and get through the storm, I am just not sure how.

Does anyone have any advice?