Op, what you are suffering from is the typical delusion/misunderstanding that what is important for many women in a partner, is the same as what is important for men in a partner.
It is not.
While there are exceptions to every rule, in general men are not really wired to look for a provider. Many (most) don't look at women in terms of what they can provide and how well set up they are.
(If that were the case Mumsnet would not be regularly posted on by frustrated, saddened, stressed women with great careers, their own property, their own car etc. who are single and struggling to meet a partner (with whom a relationship be ones steady, serious etc) and really scared they're not going to meet one in time for a family etc.)
In contrast, men are more wired to look for physical and personality traits they are attracted to and admire. (Not that women don't look for those too but they are generally balanced with provider potential, not so much for most men).
If they are very attracted to her, like her personality and think she's not any of the things that might make their life very difficult (eg total spendthrift, addict of some sort, promiscuous, unstable, extremely selfish, irresponsible etc) .... She's in!
Many men are also prepared to take on kids in the longer term. Especially when it's not large numbers of kids (!)
Don't overthink it. You are a good person, he likes you, he's probably very attracted to you, he probably admires that you are a devoted, responsible Mum and knows that you would be if you two worked out long term and had a child together.
There was a male poster on here who said when he met his wife she was a single Mum of at least 2 kids living in council housing. I'm not sure if she was working or not.... In any case he said that he was very attracted tonger, the feeling seemed mutual, they had great chemistry, got in well/were compatible, had a good sex life when they got to that part etc etc. He said their attraction and sex life was still good years later and he was glad to be with her. I don't think he's an unusual man.