I came to Thailand for work in my 30's, met a 17yo Thai girl (Mew). Mew never had children, we had 2 children together, I never married, Mew wanted to get married, I had no need, I didn't know Thai marriage law etc. didn't need a marriage visa for residency.
We grew apart over the many years, we still talk occasionally but never see each other any more, I still see my children.
I met a few girls over the last few years, I now have a gf in her 20's, she's sweet, soft, cute and she likes me. I spoil her to death, why not she's exactly what I want, it works for me.
Glad I never married.