Well I've now actually watched the video and to be honest there isn't much more he can say or do. He admits a mistake and says he will try to regain people's trust - what more can you ask?
Perhaps it'd be easier if you imagined how bad this government would be without the Liberal Democrats' slight influence. I still think they need to show more metal and veto or force through something big to regain support/trust.
I voted for them and am too disappointed, thinking I probably won't vote at all next time, but at least he admits the mistake and apologises - even if it is way too late. However, wouldn't scrapping nuclear weapons, as they also proposed, pay for it?