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Well, if you read the words you just wrote, you sound pretty clear to me that you desire to be on your own. It sounds like you want to experience other things and other people and you are young enough to do so. This has been a nagging feeling of yours and it may be time to honor those feelings. I would be open with him about how you feel and what you want and yest it might be tough and painful for both but maybe taking this time apart will give some clarity for you that it is the right thing.
Wanting more and new experiences isn't selfish...you are allowed to have those desires and allowed to pursue what makes you happy.
My pleasure. Be well and I wish you the best.