How do you fight Aatrox?

Not complaining about anything, just wanting to know how to fight Aatrox. As Sylas, I got first blood and backed, and he teleported into lane, got no items, while I got items, but he was a level ahead, should I have not backed there? I was 50% health and thought I needed health. From there he just kept bullying me in lane and when I tried to trade, I did practically no damage (He had no MR), if it was the right option to back, should I have gotten armor or more damage, potions or what? Hoping I can get some tips, ty and gl on the battlefield. ^^
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