You shouldn't need Relate so early in a relationship, the early part is supposed to be the easy part.
Rather than investing in relationship counselling, perhaps individual counselling about your lack of self confidence might be useful.
People can only treat you badly if you let them. He thinks you should be grateful to have him, so he can sulk, give you the cold shoulder, stand you up, and you'll put up with it, because somehow you've given off a vibe that it's ok to be treated like this.
This needs to stop. You say you will talk it through and he needs to make changes. I think he'll say what you want to hear, toe the line for a week or two, then revert to type.
Lots of guys get caught up with friends celebrating a football or rugby win, one quick drink leads to two, two leads to a night of fun and hangovers the next day. It happens. But the tone of his text, which you had to chase for, was very cruel and disrespectful. It was taking the piss.
If I received a text like that I'd dump him. If my daughters received it, they would do the same. By now saying you'll talk about it, you've already given more than most women would, which is a chance for him to treat you like this again.
You want a baby, then like suggested, look into other ways to have a baby. I doubt he will commit because right now he's in control of the relationship, and he won't want it to change. You've invested more, he knows this and is using it against you.
He doesn't respect you, so start respecting yourself. You are worth so much more.