so im in the military and just got stationed overseas where my wife and son couldnt come with me. right before i left she started her mood swings. at the time i didn't think much of it because i just thought she was upset and pushing me away to make it easier for her when i left. i didnt like accepting how she was treating me, but thats how i took it. after about a month of me being here i finally convinced her to go talk to a doctor about whats going on and after some time they diagnosed her with bipolar disorder type 2. im learning as much as i can about this disorder and doing my best to get on the same page as her and her current mood, but when all we have is skype, text, and phone i can only get as much as she gives me.

So, obviously this is really rough on me and her but my huge deal and main concern for this post is the fact that people say that they cant control how they act and what they do when they are manic. in some things i can accept that, but one night when my wife was at a -2 she confessed that she spent the night with a guy, and had some foreplay with another guy, and had sex with yet another guy. all about a week apart from each other and only a few weeks after i left. i also have read that some bipolar people reach out with sexual desires and like the thrill of being chased, but wouldnt the love for your husband be enough to deter you from reaching out towards someone else? and its not the same but we do have skype "dates" and "sex" which we both really enjoy but yet this still goes down. and she cant even tell me that it wont happen again. i promised her that i would never leave her, but i cant be with someone who isnt faithful to our marriage. but that brings another problem is it even right for me to ponder divorce since she at least claims she cant stop herself from doing the actions?

now can anyone help me out and try and help me understand how someone that claims im the only person they want to be with can "allow" themselves to be with someone else and want to be chased by them and like flirting back?