What does this break up line mean?

We were dating nearly 8 months. Last night he hit me with this line, out of the blue, after 6 months of I love you's, he claims "I just didn't develop the feelings I thought I would"... WHAT THE HECK does that even mean?

I tried asking for clarification and he couldn't give me a real reason. He just keeps reitterating how he wants to stay friends and how amazing I am, but it really sucks to not have a real reason to end our seemingly loving relationship. Any clarification y'all can give would be so appreciated
What does this break up line mean?
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