I was a lone parent to DC1 for 7 years before I met my husband-to-be.
In those 7 years, the two times I dipped my toe in the dating waters were so disastrous, so draining, and emotionally destructive, that I very quickly threw in the FTS towel. God, I was a happier woman for it. People can be absolute arseholes and when you're vulnerable and trying to just be a decent, loving parent, bringing stability and income into a stretched household where a child is totally dependent on one parent (didn't have any help from DC1's dad), there is simply no room for the turmoil that careless people bring.
When I met my husband-to-be, I was a bit worried because I'd found so much inner strength. I was in a very stable place and I was feeling great about life. But we married and went on to have children. But the marriage, ten years later, ended in divorce and it was a very bad marriage. My husband sexually abused our daughter (his own bio daughter). So, that has been a clusterfuck I will never really be able to unpack. He was also horrible to his stepson, my own DS. And no, when I met and married him, I could never, ever, ever have predicted any of this, tbh.
I think I'm just meant to have children but no partner/boyfriend. FWB? No fucking way. Too messy. And that is absolutely fine by me. Sorry if this is too negheady for you, OP. There are amazing people out there who are willing to give and receive love. May you find that person when you are ready.
I just want to add, my lone parent friends who waited until their children were teens to dive back into love have ALL found deep, meaningful love. They've really found loving partners and gone on to have more children, while their older child/children are totally sound and stable. I think the fact that those first children didn't have the complexities and resentment from step-parents to deal with throughout their childhood was the making of them. Step-parents have too many expectations. They come in waving the 'I will love your child like my own' BS and it's not possible to do that. I remember telling my husband, "I don't expect you to love my DS like your own. That pressure from me is non-existent. I do, however, expect you to be nice to him and stop resenting him for breathing the same air as you." Yeah, I wouldn't ever remarry now. My youngest is 8 and I'd never, ever, ever want my kids to have to deal with an adult in the house who resents them and eats their food and uses their mum for sex. Nope!
I'm also 50 and it's much easier at 50 to slam the door on relationships than it is when you're 30 or 40. When I feel lonely, I fantasise about my postie, who's verging on retirement. That's good enough for me. 😁