Clockwork Princess question

I have just finnished the 1st book in this series, The Mortal Instruments, City of Bones. I read the Clockwork (Infernal Devises)stories first then got the Mortal Instruments. I realise everyone else is probably way ahead of me with these, as they were out first. But really is Casssandra Clare trying to break my heart. Jace & Clary, brother & sister, what tha? I just can't seem to catch a break with the love story & the choice the author is going. I did guess when it seemed to be going in this direction & just kept praying as I read that it wouldn't. But there you go, I am now broken hearted for them, as I thought that Jace was just beginning to care truly for someone, his character is very Will like. So here I am again, broken hearted for these two, who now have to work out how to be family. Well just about to dive into the 2nd book ( I have them all, I wont start a series til I get them all. Sick of having half stories told.) hopefully there is some love in their lives, it's what I need in mine. Really love the adventure this writer takes me on, love the little snippets of humour as I'm a fan of good timing jokes & snappy one liners. But my heart is aching for someone to fall in love & I'm hoping in this the City of Ashes, we have some romance.