For it to be a genuine encounter, we must always be able to assume that it is the beginning of a possible adventure. You cannot demand an insurance contract with whomever it is that you have encountered. Since the encounter is incalculable, if you try to reduce this insecurity then you destroy the encounter itself, that is to say, accepting someone entering into your life as a complete person. It is precisely this that distinguishes the encounter from libertinism.
This whole interview is magical. I recommend it. Alain Badiou in Verso Books.