Why do I feel this way?

My bf of 4 years recently went on a trip with some of his friends for a few days. It was the first time in years that we had spent more than a day apart from each other. I thought I would miss him a lot, and I hate to say this, but I didn’t really miss him at all. Now that he’s back home, I feel awkward around him. I feel quite distant from him, and I don’t know why. I thought distance was supposed to make the heart grow fonder, but it seems to have had the opposite effect on me. Any advice/insights? I love my boyfriend, but I don’t know what’s happening. Am I a terrible person for feeling this way?