Right stop OP. Been here a few months ago. After dating extensively over the last three years, I thought I could spot a wrong 'un and a wrong line too. I really did think I had my shit together.
Then out of a FWB situation, I fell hopelessly in love. So much so I started to change radical things about myself as he wasn't happy with them. Of course, the more they take the more they want.
Juxtapose that with words of I love you like I've loved no other, Marry me, spend the rest of my life with you, father to your kidsetc.
And I fell for every single word. I had no reason to doubt him. he was absolutly and ytterly consistent. Even down to seeking reasurance from me that I wouldn't break his heart.
Of course, in the end it was nonsense. Thing was, where a lot of women use sex as a bargaining chip, I do not. I am a submissive - no need to say the word 'love' to get me into bed. He could have had it anyway. All the more baffling then really.
My advice. Don't assume that everyone else thinks like you and is as honest as you. There are a lot of damaged people out there with the ethics of a gnat.
Head up lovely. He did you a favour. YOU are the winner here.