"We have no "coupley" friends of our own or friends with children that we could hang out with but that doesn't bother him as he says that friends will come and go but we will always be a constant. "
and then:
" he likes the fact that we'd be tied together for life."
I bet he does! If you are looking for an ulterior motive, it is right there!
He wants you, and only you. And your child. You go out to work and bring the money in, he stays at home and look after the baby. You want a secure job and a step on the housing ladder, but he does not care about that, does he?
In fact, he has been in and out of jobs, and now when he has a job he is not enjoying, he is looking for you to provide him with a child so he could stay at home without guilt, in order to motivate him. Had he shared your values, he had also been keen to bring a stable income to the table, and to buy a home rather than rent. He wants to lay all the responsibility of earning on your shoulders now.
"He actually said that me giving him a child would give him more motivation to succeed in his life "
This is a massive red flag. His motivation should come from himself.
But how does this tally with his ideas that he should be a stay at home dad while YOU work?
"He is very much thinking have a baby and go with the flow type thing."
So he does not really have a plan. And at the end of the day you are worried that you will be landed with all the responsibility of the home anyway.
"At the minute it is destroying us and forgotten how to be happy together." I am not surprised.
You say your family want you to be happy. How is he getting on with your family? His own?