Advice about our issue?

She's not ready for prime time and probably either are you. The courtship period is usually the time when couples treat each other better than they ever will again. In your case, one party has given herself permission to 'explore.' Once someone does this, the trust has been breached and, w/o trust, you have nothing. Now you have nothing. End it and find someone who IS ready for something stronger than dating and ego gratification. You need a grown-up to spend your life with - not an adolescent who still thinks of personal power as you knowing another guy was paying attention to her. I'd bet this isn't the first you've had that fi is not yet ready.