How would you feel if your boyfriend lead you to believe he wrote something heart felt but it was actually copied from a site?

He gave me a bday card and I was about to cry at how loving it sounded but then some of it didn't sound like him because there's some things he's mentioned that we have never done before, and i looked it up and realized its copied word for word. Would you be pissed and start wondering if his feelings are even real or am i overreacting?
How would you feel if your boyfriend lead you to believe he wrote something heart felt but it was actually copied from a site?
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