When you ask something, try to be more explicit. You mean you found your GD two years ago but now you're not sure if he's your GD? Or? Your GD does not change. And you can also receive advice from other Demons as well on various issues.
The different methods by which you can find out who the Guardian Demon is have already been discussed here on the forum. Use the search option. Besides the general things, some members have already shared their experiences and maybe this will help or give you some ideas. If you are not sure who he might be now, no worries, you will find out.