Am I good enough?

I've been with my boyfriend now for nearly 2 years. We've got a beautiful 7 month old little boy. 

My boyfriend has always been there for me, even before we got together we were the closest of friends. Just lately I've been feeling really down in myself...feeling fat, ugly, not good enough ect. I think it's a lot to do with having a baby. My boyfriends phone plays up all the time. Gets no service at all in the house- anyway he asked me to inbox someone on his Facebook for him...and in the search bar was this lass who we both know. She's a page 3 model. My heart sank. I went on he profile and there's just pictures of her with her tits, ass and even more hanging out on show for all to see. I didn't tell him I saw as I didn't think it was a big deal. But now after seeing he's been looking at her I feel even more self conscious. I know he's attracted to me because he's constantly bugging me for sex. She's everything a stereotypical model would be. Gorgeous, blonde, blue eyed and body of a goddess! And then there's me 😒 am I over reacting or is it just baby hormones playing with my emotions? I don't care if he watches porn or whatever it's just we both know this lass...which makes it worse. ( he also did work on her house earlier in the year). Can I have some advice please- honest thoughts. 

😘