If I were having an affair and wanted to keep my marriage together, I'd be more likely to end the affair if my husband found out about it. His knowing, or my family, or friends knowing about it (and reacting negatively towards me about it) would make it less appealing. If it were not too "advanced" I might even end it. But if my connection with the OP had grown strong enough, or the relationship had already become very intense and important to me, I might risk more and be willing to ignore others.
There is no arriving, ever. It is all a continual becoming.