His friend slipped up and said: 'it's not that he doesn't lov-' but stopped and changed the word. What does this mean?

He said that he didn't feel the same way but he's been opening up to his friends about how he feels and said that he does care about me. I've had some of his friends asking me if I would go back to someone who rejected me and who should make the first move in that situation. His friend also told me that our situation is different to his situation which is basically he likes a girl and she doesn't like him back. He told me, 'it must be difficult that he won't open up to you directly' and said 'it's not that he doesn't lov-' and then stopped himself and changed the word. What does this mean?
His friend slipped up and said: 'it's not that he doesn't lov-' but stopped and changed the word. What does this mean?
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