Is it normal i am frustrated i can't break it off?

Find happiness and don't look
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I agree with the above three^^^

Sometimes you have to be cruel to be kind.

you can still break up with her. you're not obliged to be her partner just because her sister is dying.

if anything it's cruel to string her along.

What you need to do, however, is break up nicely. Don't beat her up over it, and let her know that you'll still be there for her in her time of need.

and of course mean it too.

I'd also recommend, don't flaunt any new relationships at her... you can start looking again, but don't rub her nose in it...

So you'll wait when her sister die and then you'll break up. I sincerely think that one should not stay in a relationship out of pity. But if you think that you are helping her then you are old enough to think for yourself