Now, you know the answer to your question....they are there because they are sleazy enough to validate, affirm and adore your h. They are just like a drug to him because he's getting the attention from someone who really doesn't know him and he can sit there and lie till the cows come home or pigs fly. He can rewrite history and make himself out as the victim and she'll just pat him on the back and say, "oh, my, that hussy was so terrible to you. She's validating his fantasy and the rewritten history w/o even knowing the true store. She's fun, she'll use him up, right along w/his money. She's desperate and needy and so is he right now. Two of kind, if you ask me. They are both looking for something and that something cannot be found in material objects...what they are looking for can only be found within..true happiness w/themselves.
You are better than this, so why are you questioning your morals and how you live your life. You are not here to compete w/her. Eventually she will tire of her boy toy. The relationship is too new to end, but at some point it will.
So, pick yourself up, dust yourself off and promise not to snoop again....
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.