Why doesn't he dump me?

I'm not gonna go into it, but my bf doesn't love me / care about me anymore, he's not there for me, he doesn't want to talk to me, he's admitted I'm a burden, he's not sexually attracted to me anymore, I'm his bottom priority, he doesn't miss me while at uni, etc. He doesn't admit it, except giving indication when I probe him on his feelings, but the change and his inconsistency and behaviour proves it.

Throughout the whole relationship I've told him I don't mind if he found someone else and broke up with me, so long he doesn't cheat and does it respectfully. I really don't put pressure on for him to stay with me, quite the opposite.

He is arrogant, very friendly and confident, talks to lots of girls etc so he knows or thinks he could easily get a new gf. He also has a very busy life with lots of hobbies and studies hard. He is a very stable person and doesn't lean on me at all.

I feel like us breaking up is an inevitability, so what reason would he have for staying with me and carrying on some sort of pretence that he still loves me? I just don't understand, unless he's keeping me as a backup?

Why don’t....you break up with him? It’s the 21st century and it sounds like he’s treating you like sh*t.

But he's the one who has basically ruined the relationship and I still love him, I know I should leave him but I still want to know why he's doing this and I think he should break up with me

Many people have a bad habit of clinging to someone they're not happy with until someone better comes along. It's usually out of habit, not wanting to lose the friendship, or to avoid loneliness.