Not sure if this would help or not ??
But I already had a young child (age 2) when I met my curent partner.
He was almost in his 40's and had gone through his life enjoying being "young, free & single".
He never thought he would ever want children.
He knew I had a child as soon as we met....and he felt akward, because he'd never been around children.
so the thought of becoming "daddy" to someone elses child was a lot to take on board!!
Afetr some months, we were in a very strong relationship....he loved me and "accepted" my son & me as a family.
It wasnt until some 5 years together that I felt secure enough to have more children with him...he'd been faithful & loving without faultering in all that time.
we have been together 15 years now...and now he has 3 boys with me also...and we are expecting even more.
Having his own children has brought a new sparkle into his life.....he adores & dotes on his children (noone ever thought this man would even become a daddy!!)
My oldest son is now in his teenage years....& my partner still feels "akward" disciplining him..etc...but he is always kind to him & honest...never leaves him out or makes him feel different.
we make decisions together regarding his future, pocket money etc etc...
If your partner "accepts" your children....treats them kindly (theres always going to be a slight difference to how he treats his own) as it must be hard adjusting to someones elses children....esp if their dad is still very much in their lives...(my ex wasnt)
but I would think this man loves you...and will undoubtedly love his child too....
and he will , as the years pass, come to have strong paternal feelings towards your children no doubt.
I personally think that every man deserves a chance to try...
you cant expect him to just take on a family...it takes a few years to adjust to life as a dad to other ppl's children...
after some years...he will become comfortable...and you will be a family unit...
when your other children are taken out by their dad...make the effort to take your child out too on the same day....so noone is ever left behind
you will know in your heart if he is sincere about being a family & trying....
If you find he ever does let you down....you are strong enough to cope....you've done it before & you can do it again.
but I think he was initially overwhelmed by the enormity of being a single man...to a family...so soon...
If you love him....and he loves you.....you should try.....and dont let doubts get in the way.....
give it time.....talk together regarding concerns & worries....never brush issues under the carpet.....if you always talk & listen to each other.....then you'll never have pent up emotions that could potentially cause problems....
hope my opinion helps x