How is it possible for a sunset to look so dark?

Lately, I've been sick. Not just physically but most of all psychologically. I feel like staying confined in this one room and not going anywhere because this world has been making me feel disgusted and uncomfortable. Why is it that it's so easy for people to betray each other? 
The people who you love can turn their backs on you so easily, and people who you don't know all that well but don't expect to screw you over, do it without even realising it. By staying here between these walls, I know I'm screwing myself over, but I can't do, go or whatever... 
When I was younger, I kept looking for that someone to pull me out of this same sort of confinements, I found someone but got abandoned shortly after. So all in all, should I look for someone to be by my side this time, too? Is there any point when they're going to leave just as he did? 
I wish I could break out of this circle of trusting people. Sadly, there is only one answer I keep stumbling upon and it's a nasty one. "Not my cup of tea," as Krissu would say. But really, in whom am I going to find comfort this time? And how long will it last? 
I can't break out of these walls. Maybe there's only one way to go - deeper. It used to feel so nice there.