first, i dont believe in luck. sure, circumstance plays a part, but you should get as much good circumstance as bad. if youve been cheated on by 2 wives and been used as a rebound by the subsequent 2 girlfriends i would really strongly consider the possibility that you are 1) attracted to women predisposed to doing this stuff 2) attractive to women predisposed to doing such things 3) mismanaging your relationships, and thereby making them prone to women behaving in this way (ie seeking something/someone else)
the other thing is that your previous experiences have made you suspicious, and therefore needy. neediness is HUGELY unnattractive, and also, suspiciousness in regards to cheating undermines relationships massively
i think you should chat to a relationship counsellor/dating coach. seriously.