Mama....I can sure feel your pain and anxiety...my first gut reaction was to activate GPS on his phone without his knowledge and track his general movements online (yes, I did this....$15 a month was far less then a PI)...my next gut reaction was to rent a car and wait outside his work for him to leave and tail him.....my third gut reaction is to take him aside....give him a few strong drinks then just come out with the "cut the crap" talk....siting that his "friend next door" spilled the beans and you want to hear it from him....from his mouth....you deserve to have the truth and to make decisions based on that....you don't want to be with him if he is choosing to be with another person....there are so many reasons for this but not the least of those is STD's....and no one every plans to get those....no one would sleep with someone who had one....yet they keep getting spread around....because people aren't being honest...
Mama...I really don't know what to say....I think I would be ready to cut bait or fish if I were in your shoes...if he enjoys your company, spends the night with you, loves his children....then he just might make the right choice...if not immediately...eventually....
You have a lot on your plate for this next week....I think I would just pray for now...get through the family visits...then decided what you NEED to do for YOU...
(If he has a cell phone that is fairly new and you can access his account....or create one for him online then you can activate the GPS....I can tell you this gave me peace of mind because at least I could KNOW where he was....but you have to be true to you and be able to live with the answers you get (*(*(*(*(*(HUGS)*)*)*)*)*)