Does either of your parents have a substance abuse issue? My parents have been married 43 years and have a good, solid marriage where they do things for each other and separately from one another. I agree - healthy and lovely to see that it exists.
NOT easy to have with an addict. We have a whole different set of dynamics that we would encourage you to learn about to protect yourself and your existing child - not to be independent for the sake of being separate but being objective. Nobody here has said "don't love him. get out, get away! he's evil." It's just very easy to go down with the ship, like LTD has pointed out. Be aware, keep your eyes open and learn about the disease you are dealing with. Because you love him, but you also love yourself and sweet baby.
We just invite you to read on more threads than this one, including the brilliant sticky posts. I will stop lecturing now.