i quit because of the green monster boss

I feel si angry yet so sad. I love this game. Even planned getting a tattoo. But this boss was just so hard for me I can't even explain how.

No previous bosses made me feel this way. I had no problem with Romeo (actually really enjoyed this one), BRB, even the clown seemed pretty easy and doable for me. But this monster... that's a different story.

I tried literally everything. I know it's only my fault. But still I feel like he's absurdly hard. I watched every single youtube video, but it seems like I cannot learn how to do it, or how to calculate the right time to block or react somehow. Tried to block, dodge, but one mistake and you're out. He has absurdly big damage and two whole health bars. I tried specter, throwables, cube, different weapons, levelled myself, yet no happy win for me, not even after 81 tries.

Applause to everyone who finished this game. I loved every second of it until this boss. Maybe I'll come back one day, but now i need some time to chill myself :D

EDIT: I finally beated him yesterday. Thank you all for amazing tips and support. I took a day off and after that I have really seen the pattern of his moveset.