If she is willing, you have not pointed out whether she is or not but just on the very brief post, counseling could be good if she's willing.

If not, if after 2 yrs she does not believe you are there for her and are going to stick around, I say likely it's best to move on. For 2 yrs you've been faithful and with her. One should not spend the early years of any relationship trying to prove to their mate that they will not betray them.