Should I leave him?

When I talk to him, he sometimes interrupts me with, "I love you!" (It may seem cute, but when I'm trying to be serious with him and he does that, I feel like he's not listening and trying to shut me up)
He's lazy
Unmotivated
I pay for everything (that doesn't particularly bother me, but when he finally gets some cash, he usually doesn't pay for me, just him)
I always come up with the plans of what to do for the day
He's always playing video games or on the computer
He didn't celebrate my birthday, he just played Pokemon
After he said he'd make up for missing my birthday, he forgot to
Most of the time he only pays attention to me if I ask him to
He's clumsy
He's cocky and full of himself
He's afraid to stand up to his mother who tries to dictate his life and I have to push him to
No matter how often I tell him I don't need big presents and would prefer un-materialistic, cute gestures.. he doesn't listen