Easy peasy

Since you've been away I can think of nothing to replace you, I never expected to
See that I'm held up looking for problems/ What's wrong with you? Cos if I'm with you it's easy peasy
How do you fancy making a list of things that you might want to do tonight?
Even Sherlock Holmes had a habit, so what's wrong with you?
Find me something to hang my coat to, tie a rope to, maybe write a note to, for security
Well if you're with me it's easy peasy
Like all brilliant people I'm a nightmare to be with but I thought you might still want to be with me