Can I date, marry my sister’s ex-boyfriend?

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Is the response from from her mind? Or should I find another guy? Am 28 years old I can't enter 30 single like this. God forbid! What do I do?
For illustration

Please, am confused at the moment. My sister dated her ex-boyfriend for 4 years, she lives in Abuja now and I live in Lagos.

I have been getting close to this same ex-boyfriend since the lockdown started. We have kissed and done some breast foreplaying but no sex yet.

I asked my sister for her blessing and she said yes but asked if I can give her my own blessings to sleep with my ex In Abuja?

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I was confused and shocked how fast she responded, because I hate my ex-boyfriend o.

Is the response from from her mind? Or should I find another guy? Am 28 years old I can’t enter 30 single like this. God forbid!

What do I do?

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