We just don't get on anymore

[Mynewone]

Name changed as oh knows my normal username.
We've been together 8 years and had our dd over a year ago.
We have always got on really quite well. Never any arguments only a couple in the whole time we'd been together until recently. It's just so hard i want to make this work but we are more like work colleagues now we do 'our' jobs work, housework, shopping etc.
We haven't had sex in months- I'm too tired but that doesn't stop me feeling guilty.
I'm fed up - sat here crying after another petty argument

Want to add that dd has brought us so much happiness we are the proudest parents and when I'm with dd or at work I'm fine my problems are just with oh

If you're in a rut, taking each other for granted and living alongside each other like flat-mates... and it's easily done.... then you have to set aside some time to properly communicate and reconnect. 'Never any arguments' is not necessarily a problem but if it means you've never even disagreed in all this time that can mean that the relationship has never been stress-tested and you don't have a good way of resolving difficulties. It can also mean that the relationship is unequal i.e. one partner making all the decisions and the other just going along with it for a quiet life. What was the petty argument about? That might provide some context.