It’s easy to “fall” for other people if you let yourself. What’s hard is to commit to someone and not put yourself into situations where you are tempted. That said, life has a way of throwing curve balls at us and it’s not really totally realistic to avoid everyone. Does this person you’ve “fallen for” know about your other relationship and if so are they deliberately acting in a way that makes the other relationship less attractive? You said the person helped you realize that you were not being treated the way you should be. It’s easy for someone to provide “what you need” when they know there is a problem. It’s also normal to have doubts. Take a step back and examine both relationships. We are constantly learning and getting new information. Only you can decide how happy you are or how happy you want to be, or if your current relationship is worth saving.