Don't know what to do at all

[shattered88]

I'm in a relationship (4 years together 1 child aged 12 months)
For a while now, my partners been coming in from work drunk about 3 times a week. I work too, but on my days off In the week he's coming home drunk. He's a nasty drunk and he's very childish (I don't want to run him down but I'm just telling it like it is)
I've explained to him I don't want him coming home drunk so much to me and his son, he puts a lot of pressure on me when he does and I don't and won't trust him to be alone with my son when he's been drinking.
About 6 months ago he told me he wouldn't drink after work, if he wanted a drink he'd wait until he was at home and when our son is in bed.
Anyway, he's been coming in still clearly drunk, smelling like a pub, but is adamant he hasn't when it's clearly obvious. He tells me I'm crazy blah blah.
Our child is in the best routine, he's such a good boy and I don't believe it's the stresses of being a parent (he was doing this a lot while I was pregnant too)
I feel like I'm living a life with him that I don't want to be living. I've tried every which way to come to a solution over this. He hasn't got a drink problem, but when he has a drink he takes it way overboard.
I've had enough of being lied to and I'm ready to leave with my son and live a peaceful life.
Am I being dramatic?

Ive been where you are, my son was 6months old when I left my ex.
It was the hardest thing I've ever done.
I had a new baby, all these hopes for the future, for us as a family. Its hard to let go of.
On the other hand I had a man claiming to love us, he even got specialist help after telling the gp how much he drank, but not showing it. At all.
I realise now he never loved me as much as he loved booze.
I loved him. So much, but it was never really reciprocated.
I had my own issues. Co dependency, daddy issues, disinterested mother, low self esteem.
Spending all his wages in the pub where he had obviously been the life and soul then coming home too drunk to even talk to me.
Too drunk to hear the baby crying in the night and useless even if he did wake.
Falling around to the point I was worried about babies safety.
I was angry and so disappointed that the resentment built up so much, it wasn't even his behaviour that made me leave, it was my own, when I realised I'd become a completely different, awful person.
I didn't want my son to grow up in that environment so I left.
We're happy now.
Son is happy and healthy, ex stopped drinking at some point that was nothing to do with me, he's not the best dad in the world but he has a good relationship with son.
Long story short you cant change him.
Even threats to leave wont change him.
You need to protect yourself and your son.
First. Put you first because he wont.