My insecurities are killing me..

I gave birth via c section 6 weeks ago.. and i just need some help and this is the only place i could come.. so i got married to the love of my life last year. And hes never actually had a girlfriend im his first. Hes only slept with 1 other girl and he didnt finish either.. for some reason i cant help but feel insecure. I've only ever caught him stare at a girl once and i confronted him about it and since then ive never caught him. I cant help but feel ugly.. i cant help but feel like im not good enough for him..im always accusing him of staring at girls because of my own insecurities. Hes told me time and time again that im the only girl in the world for him.. why am i so insecure.. its killing me..