Would you lend money to an ex?

Would you lend money to an ex?

I've been reached by a friend - with whom there had been something in the past - who asked to borrow a substantial sum for admittedly important reason. She swore she'd paid back monthly and she understands and won't carry it against me if I say no, and I replied I'd think about it and let her know.

Updates
+1 y
For those still wondering, in the end I did NOT lend her the money - first to not set a precedent, second because I found out she somehow managed to buy a new, expensive car and is going on vacation to an exotic location.
So she had the money to treat herself, but not for her basic necessities.
Would you lend money to an ex?
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