If a man is only bringing flowers and gifts after he cheats or is a jerk, isn't that already insincere?

I've seen this happening in both movies and in real life:

The relationship is over because either he cheated or was a jerk and all of the sudden, he shows up with flowers or gifts, hoping to win her back. Isn't that already insincere? Gifts are suppose to be during your happy moments (at any random date, not necessarily on her b-day nor Valentine's Day, any day), because it's a gesture of love... not because you're trying to win the girl back.

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Honestly that wouldn't impress me at all. It would be like an insult. He still cheated or was a jerk. Why would I suddenly want his gifts? Why didn't he gave those gifts during happy moments when there was no issue in the relationship, when she trusted him?
If a man is only bringing flowers and gifts after he cheats or is a jerk, isn't that already insincere?
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