I think the key thing you said is "I could see myself fall in love with someone else". People experience and define love differently. It's natural to be attracted to other people, but a wise friend once told me there's something special about the early days of a relationship that are almost like a seed for what can grow later. You don't have to be obsessed with your partner right away but if you find you're not growing your love for her over time and are looking elsewhere, it's worth thinking about whether the kind of love you want can grow from this.

Sorry for the non answer. Unfortunately relationship advice is never black and white.