I would think it's up to her who she has sex with more then the cuck husband, if she sleeps with other men already it's not for you to say no.
Basically stay in your place.
Yes and no, I am not jealous that he is fucking her, and she loves that, but I do feel uncomfortable that she is too available for him, like she will call in sick for work if he has asked her out for a day date and she probably has more clothes and jewellery from him than what she has bought herself or I have.