Sounds to me that you are unsure how you might feel about a possible mutual polyamorous situation with your boyfriend down the road, and that perhaps you'd be okay with it. It may be a good time to explore the question: Under what conditions might I be okay with my boyfriend having other girlfriend/s?
What some folks do is commit to being monogamous for a given, relationship-building period, after which they explore a possible opening up to poly. The idea, here, is to establish great trust, confidence and security in the initial relationship, which -- once fully established -- can feel so secure and comfortable that allowing other loves to enter the picture is not so daunting.
Of course, you can't be sure how such an experiment might work itself out. But you may like to talk with one another about such an option.