Pink what about a trial seperation? Now I know I'm just a wee 21 year old and am not married and you can tell me to shut up if you wish but, I have had some pretty horrid partners in my small 21 years.
Because of the way I am, and the way I think, I would not put up with it. At all. Yes people say things in the heat of the moment to hurt you, but why do you have to put up with that? You're married and have a young baby, you want the 'ideal' for your child. A mummy, a Daddy, a nice home, happy happy happy. Sadly it doesn't always work out like that though, and sometimes you're better off braking away and being happy as two seperate people, instead of one miserable couple. It may also work out better for Lexi as well, growing up in a home with two parents who fight, don't love each other any more and generally have very little to do with each other, is not a nice enviroment for any child to be in. It's been like this in my home for the pst 15/16 years of my life, it's not pleasant and playing at 'happy families' is exhausting when you're far from it.
I would, if you still want to, try and talk things out. Relate sounds like a great idea if you can get your dh to do it. My only concern would be the waiting time for it. But if there's a chance it can reconnect you both, then fab.
If things get very bad, how about a trial seperation? Agree with each other that during this time you'll have time alone, time as a family and time as a couple without Lexi. This will either make or break you but will be a great indication as to where your marriage is. If you think it's done you both good then great, if you feel like you both want to part ways, then at least you can try and do it amicably without being under the each others feet and getting angry at the whole situation.
Don't know if any of this matters/helps in any way, I'm not very good at this kind of stuff. I'm a huge relationship pessimist and don't hold a very sunny view on the whole. I'm sure this is setting me up to be a future spinster, but I've got my amazing dd, and so do you. That at least makes me
Thinking of you.