How much of this is the alcohol?

Stop interacting with him. Go away. Leave him alone. You are allowing him to make you miserable because he is miserable.

Make it a goal to go 24 hours without speaking to him. Then, make it a goal to go 12 without thinking about him. Go 3 days without going into his garage.

M42 W40
T17
M15
S13 S11
BD 7-14
A discovered 7-14
WAW moved out 10-3-14
D final 2-23-15