Really interesting thread and responses!
I'm a solo mother by choice and had my child via as sperm donation (sperm bank).
Up until that point (aged 39) I'd genuinely wanted a relationship (living together, children etc no marriage though as I'm divorced) and was quite miserable that I'd ended up single in my late 30s not through choice.
I'd had FWBs and a couple of relationships during the period of being 36-38/39 however none of it worked out in the end. I think I was experiencing some sort of hormonal 'surge' where all the feelings felt so intense and encompassing.
Now that my son is here it feels as if I've experienced a lobotomy lol! I have totally lost interest in men and romantic relationships. I'm certain this is post partum hormone slump, and nature's way of ensuring I focus on the child however imagining long term and when this post partum period settles, I can't see myself living with another man again. I think romantic relationships can be fun, enriching and enjoyable but I seem to have been unlucky in finding a suitable partner (so far), and now with a small child in tow, really don't have the time or headspace to develop any real intimacy with anyone (nor do I feel I want to).
It's hard to say whether I'd feel really lonely and isolated without a child, I desperately wanted one, and I was extremely lucky to have conceived, and now that I'm a parent so far it's been a wonderful dimension/experience incomparable to any other relationship I've ever had. I did enjoy my own space however friends all coupled up and busy with their families and children, I'd often felt like I was waiting for their (sporadic) invitations and the weekends felt very lonely indeed.