Wasn't it convenient of him to ask you to marry him when he was already married! And do you really think 3 sets of divorce papers mysteriously grew legs and walked away??? If he wanted to be divorced and free to marry you he would have climbed mountains to do so. Obviously he's not on the same page as you...
His flirting with other women is another pretty good indication. He knows it bothers you time and time again yet he continues. Even if you two were to finally marry do you really think that behavior of his would stop? His actions show a clear indication of his lack of respect for you and your feelings.
I can't tell you what you should do but after 8 years of his inability to commit to you and his flirtatious ways I think you've got some huge red flags staring right at you, be careful what you wish for!
