Advice on how i should deal with it

In the last few months my life changed completely , first moving away from home and going to college in an other city then my brother getting a bitchy gf and me losing the connection i had with my brother

My brother is a leo and his gf is a cancer

Anyway since he got his new gf he changed completely, got himself a cat(he hated cats before), and whenever he comes he brings her alone every fucking time and it annoys me because it doesn't look normal to me and my parents don't seem to mind

They act like a married couple(which they are not) and they have been together for a few months

On top of everything he tries to act nice with me but i'm not the one who falls for tricks and somehow that hurts even more because we were very close

While growing up i had no one else ,thinking back now he was an asshole even back then, i often ended up crying from pure rage because (I don't remember what happened ) i didn't want to hit him or hurt him (not that i could)

In a way i grew up in his shadow, he was always better, while i was just somebody who was always blamed for things that i didn't do or didn't do right yet i was the fool who did things when he was asked by his parents because i loved them

Today an other incident happened, he came home again with her although were were renovating and there wasn't a bed for them, my parents said nothing again and i started acting like a cold fish who doesn't care abouth them and i wasn't willing to give up my place

But it bothered me more then it should, yesterday i asked him where he was going to sleep and he told me that in my bed and that i was supposed to sleep on the floor

Eventually after much drama i gave them my place and i'm the kind of person who would do anything for those who i care about

I don't know what do with all of this, accepting it maybe would be the adult thing but i can't do that , i don't even have my parent's support on this matter

i bought along my gf one time when they were around because i wanted her to make a new friend , turns out they can't stand each other

I don't want to lose my bro but it's going to happen anyway,I know that he cares about me and all that but i can't stand the treat some one like shit attitude and then act nice

And she seems like a gold digger to me, considering that my bro has a high wage , and the 25-18 age difference is quite high

Why is your brother sleeping in your bed if he has such a 'high wage'? Tell him to get a hotel room.