How do I know if step mom is cheating on my dad?

Anonymous
my dad is truckdriver so he is away a lot. right now he starting his own company so that he doesn't have to travel anymore. anyway my step mom is always home and she never works. sometimes she would leave the house looking good and smelling nice and come back later with nothing. usually she goes out for groceries or something. she is very attractive for her age. MILF if you will. but I'm just always worried if she gonna hurt my dad and I would kill her if she cheats on my dad. sometimes me and her talk and she casually mentions a divorce Because of my dads job. I don't know should I follow her one of this times? how do I make sure my dad doesn't get hurt? also she doesn't have any friends so she can't go for a coffee with her girlfriend or something like that. and from what she told me about her past it seems like she used to be promiscious and she loves sex. any advice would be appreciated. thanks
How do I know if step mom is cheating on my dad?
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