I get all of this so much.
I've only got close friends in the last 8 years or so. I spent most of my twenties very lonely. I had DH, and he's amazing (well, not tonight, tonight he's annoying), and we had a group of mutual friends that we met when we moved to this city. All men. I had no female friends to go and get a coffee with. I tried through work, and it didn't happen. Then I met one woman through work that I became incredibly close to. And then she bloody moved to Australia! Leaving me floundering again.
After DS1 was born, I was proactive and went to groups, joined things like Meet-A-Mum on Netmums (which was actually really good for linking local mums). Thought that I had a solid group. And I did for about two years. Then started seeing that myself and one other were being left out of birthday night's out etc.
The one that was left out as well is someone that I know pre-children. She was the girlfriend and eventual wife of a male friend. We would up spending time together by chance when we both ended up pregnant and due a week apart. She's one of my absolute rocks these days, and she'd say the same for me. We can rock up at the others door and announce that we've just popped in as we were passing. A rare thing in this day and age. She always has cake, I don't.
I have another very close friend that I didn't set out to be as close, but it just naturally evolved.
My oldest and other closest friend lives 80 miles away. We speak by WhatsApp a couple of times a week, and have to make a conscious effort to plan a meet up.
I joined the Peanut app as I am naturally sociable and would like more friends. I've wound up having a great connection with a woman in the next city over. No mention of meeting up, but it's nice to chat. Other connections have just fizzled out. I've learned to let it wash over me.
I tend to throw myself into local things. So I'm the chair of the PTA at the school, which means that I talk to everyone. Some conversations have led to friendships, others nothing. When my children started at their sports club, I became one of the key committee members. I'm nosy. I like to know everything and everyone. Putting yourself on the committee achieves that.
I still get lonely. I have my three besties. But that means that often they're each busy. And sometimes I'd just like to go for a nice cup of tea and a chat.