My boyfriend said he loves me to an extent? What does that mean?

Seriously! What does that even mean? Especially after 2 years! I know 2 years isn't that long, but I feel like you would know if you loved someone by then. Aren't you supposed to love a person fully; flaws and all? Then, how can you love someone to an extent and then tell them you don't want to marry them? It's like breaking up, right?
My boyfriend said he loves me to an extent? What does that mean?
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