How do you quit smoking when your spouse smokes?

I really want to stop smoking before it takes a toll on me in any way. I hate the smell of cigarettes on my clothes and the transfer from my sheets to my bedding. We don’t smoke in our home except the bathroom. The main problem is I’ve tried to quit before (I smoke half a pack a day) but my DH smokes two packs a day and when he smokes when he gets home it makes it hard for me to quit. What do I do and/or what’s the best way to quit?