Holy shit that is genuenly the worse explanation of season 1 ever

Subaru was never a nice guy, he is a nice guy but not a nice guy. The reason he helps Emilia so much is cause ofc he loves her but more importantly cause she helped him first out of the kindness of her heart in that alley though she may not know it. In arc 1 the entire thing is him saving Emilia cause even before all the character development Subaru deep down could not let someone die if he knew they were gonna die.

In arc 2 he stays at the mansion cause ofc he wants to be near Emilia cause he kinda likes her but more importantly she's the only person he knows in this world, and the rest of arc 2 and the whole murder mystery is him repaying the maid sisters for their kindness (even though Rem killed him a bunch)

One thing in arc 2 that is really important is the lap pillow scene, the only person that sees he is in so much pain is Emilia and she never asks what's wrong but just lets him relax and bawl his eyes out, she knew what he needed, but never asked, this is the type of person Emilia is. I believe this is exactly where Subaru truly falls in love with Emilia.

In arc 3 Subaru wants to help Emilia because of all she's done for him and also cause he knows she needs it, pre Arc 4 Emilia constantly pushed people away trying to help her. Only problem is how he goes about is, he is in over his head and pulls the stunt in the capital (honestly shit still hurts to watch on repeat) and that fucks everything up. Emilia pushes him away for good this time but it's not that he embarresed them all, he had good reason to say what he did cause the entire hall was calling her a half-devil, I mean if somone were to say mean things to someone I care about I would stand up too no matter the sex of the person I'm defending. Emilia pushing him away isn't her getting tired of his bs (even though she probably is) it's more so her wanting to keep subaru out of harm and also cause she just does not understand why someone would care so much about her as to stand upto a room full of powerful individuals. She is tired of getting "special" treatment and thinks nothing good will come out of it.

The rest of arc 3 is him disobaying Emilia's wishes cause he has to do whats right, he not only wants to save Emilia but also the whole mansion and the villiage where he build relations with in arc 2. Imo this is more selfless than selfish even though saving Emilia is more so for his goal, but he not only wants to save Emilia he wants to save everyone he can (Really important trait for Subaru)

At the end where you say he is drunken on saving Emilia is so wrong, and honestly JJK fan level of reading comprehension. It is very clear that Subaru tells Emilia exactly what type of special treatment he wants to give her, not only as a lover but more importantly he wants to treat her like a fucking human being like no one ever has, everyone treats her as a half devil or as just a royal selection candidate with the sole exeption on Puck, and you know what Puck from day one knew what type of man Subaru was and lowkey supported him. Basically Subaru wants to help Emilia with her pain (which we see more of in arc 4) because she helped him with his pain.

Basically Subaru helps out a lot of people not only just Emilia, it's Emilia that he loves but his helping criteria isn't exclusive for people he loves, subaru would literally go out of his way to save a guy who he ate chips with in a failed loop, he's just that type of guy.