Why does my boyfriend act different when he’s drunk/high?

When he’s not sober he says things he don’t mean to say when sober like we should have a baby and I want to be more serious with you and doesn’t call me childish he treats me like a completely different person and wants sex more often and is nicer when he’s drunk. When he’s sober he treats me like I am dumb and calls me childish and doesn’t want sex as much. I ask him if he’s drunk and he says no. He’s definitely lying right? Why would he say those things when he’s drunk/high?

Updates
1 mo
And he says we should have kids together during sex when he’s drunk but when he’s sober he seems not sure of my future with me. Why? I shouldn’t believe him when he says he wants kids with me during sex?
Why does my boyfriend act different when he’s drunk/high?
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