Can constant regret over the past lead to depression or insanity?

I regret the past a lot - a lot of it was not even my fault but there's so much regret as i was the only one affected.

I think about it all the time - every day. If only i had done this or that.

I'm starting to wonder if the fact that every day my day starts off with those thoughts is unhealthy and will push me into a depression.

Can constant regret over the past lead to depression or insanity?
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