GISH: Man, this takes time and patience. It appears that you only recently started the DBing program. I have been doing it since May, and I consider myself a greenhorn.
Here is how I see it. I assume that your wife knows that you can take action against her boyfriend, and she knows that you know this as well. I am of the opinion that she will think more of you if you do not file. Filing suit is an act of desparation. Acting cool and under control and focusing on you will make you more attractive to her. Confidence is attractive. Be able to say, "Yeah, I coulda taken him to court, but I knew you would come around."