<human>: I just had a small fight with my best friend via Whatsapp. She took something more seriously than I intended and lashed out at me. Now we apparently don't talk anymore, since I think she overreacted and was quite intolerant, and if I make the first step, I will look like the one who was in the wrong.

Since I started my job in a new city away from my family and friends, I have only made some friends among my colleagues, and she is my closest friend. We text and talk every day, and since we are both living alone, we talk about our daily lives and how we feel etc... I thought we could tell each other everything.

This small fight shows me how easily things can fall apart, how easily you can lose a friend. 
I don't really think that I have lost her forever, but what if?

Many of my colleagues are starting or already having families with kids, so they are occupied with being moms. 
I have already "lost" another dear colleague to motherhood, since she doesn't have time anymore to meet or even to talk on the phone.

My best friend (if she is still my best friend) might decide that living alone isn't the right thing for her and finally move in with her long-distance boyfriend and work in another town.

Then I would be left alone, an outsider, the "single", the "cat lady", with no one to really talk to apart from small talk.

I am quite close with my family, who live in another town. Visiting them, spending quality time with them, and listening to them talking about the numerous times they are able to meet, makes me wish to quit my job here and move to their town.

But this would mean to start all over again, find a job, get to know new colleagues, establish my position and to have the difficult task of making new friends. I'm 40, and to quote Murtaugh, I'm too old for this shit.

I am currently thinking about buying a house in this town, but that would mean settling down here for good.

I don't know what to do. I am probably overreacting, but I feel so alone right now.

Can you give me the gist of the text in a nutshell?
<bot>: A small fight with my best friend made me worry about the future, about how easily you can lose friends, and how valuable family is.