<human>: Can you give me the gist of the text in a nutshell?

My SO and I have been together for almost 4 years, we have a 2 and a half year old son and I'm currently pregnant with number 2. 

We have basically spent the last 4 years constantly with each other and after the birth of our first son we decided to cut contact with his friends after they became involved in heavier drugs and mine just slowly disappeared over my pregnancy because I couldn't buy things or party any more.

My SO made a friend [22 M] last year and hangs out with him occasionally or travels to the city to stay with his brother and helps him with his uni work. 
When this happens I get really anxious and sad. I end up texting him and ruining his night because of how much I depend on him.

He gets angry with me because I always make him feel like shit and make him feel like he's doing something wrong when it's my problem. I just really struggle with the idea that I'm so alone and pretty much housebound when he can just leave whenever he wants.

When I try to tell him how it makes me feel and how lonely I am he tells me I should join a mothers group, talk to my mother or that I should be getting enough social interaction when I go to work. 
(I work at a small doctors clinic that mostly deals with junkies where his mother is my boss and my co-workers are 3 older [55+] ladies)

**What can I do to stop myself from being so needy and dependent on him so I don't push him away?
<bot>: SO has been my only friend for the past 4 years, I'm overbearing when he goes out with friends and I don't know how to stop.