Is it very necessary to give the girl the reason for breakup even if it hurts her even more?

I broke up with my girlfriend and i couldnt utter a single word of the reason behind it at that time because i couldnt get it straight. Its been 3 months and she is still single. I regret not telling a reason for it even though she says she understands. I want her to know my reason. But i feel like not bringing it up since i think she is over it. Oh ehat should i do...
Is it very necessary to give the girl the reason for breakup even if it hurts her even more?
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