So... background.
My mate has been with this man about 12 years. Married for 2. He has cheated on her with various women , like mini side relationships for months, and left her for some, etc.
She always takes him back. He isn't actually sorry and never says he won't do it again. He knows it kills her but she would rather have him in some capacity than not at all.
So, late last year he was hanging with this girl who is VERY his type (his wife isn't but she is kind and lovely, he also isn't proud of his wife, has never put her on social media but will comment on loads of 'hot' girls photos, etc). He kept saying they were 'only friends' even though he would not come home at night; would cancel on my mate on evenings, and would text this woman when lying in bed next to my mate. This man has no shame.
She kicked him out and he 'apparently only then' started a sexual affair so she says he 'didn't exactly cheat' 
Anyways they are back together he is now back at home and on Wednesday announced he has a personal security jobs in South America leaving the next day. He cannot phone her at any point either. He has no experience in security and no qualifications in this field.
We all think something fishy is going on but we don't know much about the industry.
Any help would be greatly appreciated.
Is he on a drugs run? Cheating? Or is it legit?