Why after 6 months do I not feel in love anymore?

I was head over heels for my boyfriend a few weeks ago. Now, it’s been 6 months we’ve been together and my feelings are conflicted. I care for him deeply, and i want to be with him. But, my feelings just aren’t there anymore. I still get worried when he doesn’t text me back for a little while. Or, I’m worried he doesn’t like me either. But, i told him how i felt a distance, and he said he hasn’t felt that way at all. He got really upset because he thought i didn’t want him anymore. I do. But, my feelings are confusing me. I just don’t feel those same loving feelings as before.
Why after 6 months do I not feel in love anymore?
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