How to deal with cuckolding?

Hi everyone. I am a 25 year old male married to my wife for almost 4 years. We decided to get into swinging about 2 years ago, and as I figure usually happens, she is the one that ends up easily getting other guys. I have only been with one other girl since we started and it didnt last. Well, long story short, she has a boyfriend now and she has discussed cuckolding. She heard about it through him. She has been with him for about 5 months and she has already said she doesnt want me seeing other girls. Not that I've had much luck anyway. She has already put a chastity device on me. It's been on about a month. She says she loves me and wants to be with me but the thought of this excites her. I can't help the feelings of jealousy now that its gone beyond just swinging. After reading this and other websites, I am worried about where this will lead. How does everyone deal with this?