Read the comment again. The recipient clearly didn't like the poems, and yet he still wrote four hundred of them.
> In fact, I was told by her that these notes put her in guilt.
No healthy relationship has one partner who cares so little about the other's feelings that they do something 400 times without finding out if it's welcome or not.
"I was in a relationship for 2 years and have written a poem every day for 400 days straight to her."
2 years is a lot more than 400 days. Maybe the relationship failed because they stopped.