Yeh, I know how u feel. All while I was preg. My boyfriend used to go out all the time without me, all I got to do was stay at home, and then get to listen to him go on and on about his great nights/days out with all our friends, and get all the gossip second hand from him. It sucks real bad.
But u know what..
I let him do it, and I only fussed a little bit about it. Because he's only 18, and me too. And I knew once our little girl arrived that we wouldnt be able to go out when ever we felt like, and spend all our money on alchohol(not that I could anyway coz I was preg.)
i let him have the chance to enjoy the nine months(eight months in my case) and im extremely glad I did, because having a babie is really expensive, we both have like no money now ever, and cant afford a sitter, even for a few hours. And the few hours that we can get his mom to baby sit, we spend it asleep.
I hope things get better for you, try going out with your girlfriends a bit more, coz believe me, it will be tough once your babie's here.