Why do woman keep giving me this " Too Nice " feedback and then dump me?

Hell no they are not out the window. You're just finding the wrong women. Just continue acting the way you are and when you find a girl that does the same back to you then there ya go instant match. Its hard to find men like you these days, most women would jump on that..why they are not..I have no idea, they are just dumb i guess. dont let your hopes get down someone better will come along. Just takes time and heartache unfortunately.