As you are not interested in being with anyone else, are you willing to have half a girlfriend. Yes, she can love you both. But there are only 24 hours in each day. Personally, I’d say we aren’t compatible and be done. In a monogamous relationship when you start to feel something towards someone else, you avoid them and focus on your partner until your feelings for your partner are strong again. Find someone that wants and treasures you and only you.