"So there's no reason for you to get all out of sorts about it, hun -- and you don't need to worry about anything because I was planning to make him use a condom. But if you keep acting so jealous and possessive, then maybe I won't. So unless you want me to take a chance of him getting me pregnant, then you would be well advised to just head on home now."
When -- at your urging -- your wife first agreed to cuckold you, she warned you that she was not the kind of woman who could easily separate sex from romance and emotion -- and that she would want to have both sex and romance with her lovers.
What you did not anticipate was how emotionally painful it would be for you when she and a lover became emotionally involved -- and her feelings for this lover seem stronger than for any man she has been with before.
And although it is still early in their relationship, this is really the first time you have felt the anguish and fear that she might ultimately leave you for him. You wish there was something you could do to stop it from happening, but it's way too late for that. You will simply have to accept -- and support however you can -- whatever happens between them.