Running out of chances to give

Should I begin dating my ex-husband? We have two children together but our relationship has been everything but simple. He has been married 3 times I thought I was his first but I was his second. ( Not that i am not smart but he is just that good) He was married dring early adulthood and for some reason he was never honest about it. Well anyway, I had a sone for him in 1999, a daughter in 2000, a miscarriage in 2001,c got married to him in 2003, divorced him in 2004, where he remarried another lady in 2005, divorced her in 2007, and now we have been talking and I am so confused.