A topic away from my little one

So this has almost nothing to do with my daughter, but it does have to do with being a mommy and interacting with other mommies. These mommies are all new moms like myself, they are 3 other ladies I went to college with. Now when we were in school, we got along great (or atleast thats how I seen it), but anyways its been almost 3 years since we graduated and over the years we've tried to get together (this was before all of us had kids). Yet now that we all have kids some how the other three new mommies have had chances recently to get together and I have had some complications. Now one of the ladies just threw a 1st birthday for her little one and I wasn't invited. I'm deeply hurt at the moment and don't know how to deal with it. I think its mostly because I've become so alienated from everyone that them not inviting me was just a knife in the heart. Even the my friends who don't have kids don't bother with me, well most of them. My best friend on the other his a whole different story, she tries to make plans with me that include my little one. Anytime I have to cancel with her, we just make plans for another time cause she knows that I have responsibilities, just like she does. I don't know what to do, I need to find other moms to connect with cause I feel like I depend on my best friend too much. She has other friends who she hangs out with and I'm here with...well no one it feels like most of the time.  I hate being stuck in the house because my boyfriend doesn't like to do anything on his days off with me. He prefers to sleep, eat, play video games, go meet his mom for dinner, and complain about me. I can't take it, I need someone to talk.