I'm Complicated

Why must you cause me grief and pain, your mood swings are giving me Whiplash.
 If you were smart you stay away from me. I'm not who you think I am, I wear a mask it's complicated.
 You may see me but you don't see the wall, trust me it's always there.
I've been through a lot, and your games don't impress me, I told you from the start you would fall in love.
Don't get me wrong I'm human I have a heart, it gets broken like everyone else's,
I say this for your own benefit,
everything about me is way too complicated.