Dating Best Friend's Ex-Boyfriend
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Answer
Shalom!
Thank you for your question.
As a general rule, Orthodox Jews customarily have a “middle-man,” known as a shadchan (matchmaker), to help with such details.
There is nothing ethically or morally wrong in dating a friend’s former boyfriend. That’s exactly what happens in the “shidduch world.” When a couple has gone on a date and then, for whatever reason, decide not to continue dating, each one then pursues someone else. The final match is sometimes best friends and their ormer dating partners. There is nothing to worry about here. If you think he would make a good husband to build a Torah home with, then you should pursue it. It might be appropriate to inform Sarah, though it is not truly necessary if the dating is done in a more orthodox manner.
It is amazing that you are a sort of “shlucha” on your campus! You should continue to encourage Jews to perform mitzvot.
Good luck with everything!