When you break up with someone because you 100% lost interest, do you feel regret after?

I recently dated this person for a month and a half and then suddenly spent two weeks agonizing over things (I think I have relationship OCD).

A few days ago I felt nothing towards her suddenly but slight annoyance. So I ended things. Now I feel remorseful, and depressed, and I keep thinking of all the times we had.

is this normal? Maybe I had some feelings left?
When you break up with someone because you 100% lost interest, do you feel regret after?
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