I have recently been in a situation where a woman who is in a relationship was having some diffucult times with her boyfriend. We got to the situation where we were both holding hands, hugging and want much more but holding back due to her relationship. I was always reminding her of her relationship with her boyfriend in a way that, I thought, helped define the line that must not be crossed for her own sake. In the end she ended up feeling confused and torn as to whom she loved more and so it ended what was essentially a very special close relationship. :-(

Regardless of whether there is somthing deeper or not, you must both take care to define a 'line' you are both happy with not to cross at this time. It's a hard thing to do but what you dont want is to pull her away emotionally from her boyfriend as she may end up resenting that. That will spoil what you have. It is better for her to come to you, if that ever happens. She will respect you and possibly love you even more if you give her that space and simply be there for her in times of need.