I do not think you can be "in love" with a person you have only met online; you can be attracted to a person, but love takes being with and getting to know a person in person. Otherwise my soul mate would be several book characters I can name instead of my husband :-) Feelings are not all that are part of love, "to love" is a verb and you haven't any action experiences with it yet in relation to this person to know what's what.

Only you can decide if you'd like to leave one relationship to pursue another. I do not see any benefit to staying in a relationship where you are no longer interested in being there, just because of a time period. If you have no children or other people depending on you, I would discuss your current relationship with your current partner and create a plan to move out and then pursue whatever you decided interested you.