Is this right or wrong or...

Here it be...

I think my gf/ex(in debate) is having doubts about leaving her ex, but now he dosen't want her back. She recently put a pause on us, and I am wondering if its to see if things will work out with her and her ex. Now, I really care for this girl a lot, and she seems to care a lot about me, but I guess im #2. People say its wrong for her to do that, if that is what she's doing. If so, it makes me feel like shit... but then I think about it from her point of view. She was with him for 2 1/2 years off and on rarely then got serious for the last year and a half. There's a lot of confort and she does care for him tho she can't stand to be with him. So, if that was me, it would be hard to just not want to make it work because you're with someone new, but then you don't want to lose the new person if it dosent work. So by her having me tag a long... is it wrong? I know its unfair to me, but should I just walk away for ever or just go on my path before her till she's ready?