I see a lot of break ups and sad things written about the baby daddy's, but my question is " is…

I see a lot of break ups and sad things written about the baby daddy's, but my question is " is there anyone fighting Their own Insecurity?" My boy friend loves me and I know he does.... he gave up seeing his son and talking to his ex wife (mother of his son) to be with me and defend me.. to make me feel like I am someone very important in his life.. and when I say gave up on his son I dont mean abandoned I mean his ex tries using his son against him... she even tried sleeping over just because the son... which didn't happen or wasnt cool... I love this man Hes done so much... found a new job.. bought us a new place.. supports me and loves me emotionally and physically... he says im his first love... And last and wants to make me his wife (I know what ya are thinking... what about his first wife.. well from what I understand not only from his mouth but witnesses and family that it was a marriage of convenience ( he was a marine so marriage pays you extra and the only reason they got married was because the tramp actually poked a hole in the condom. .. and he quote on quote did the right thing...) but anyways im insecure about everything since this is my first child and Hes experiamced all this... he says he hasn't though... And im just lost because when im sad and insecure it breaks his heart... Than he keeps asking if im sure I want him.... how do you beat insecurity? ???