Hubby got caught doing drugs...

Should I be more upset then I am about my husband getting caught with cocaine by my sister? I asked him about it and he lied to me, she told me and I asked him again. He lied about it again to my face before finally admitting to doing it? 
I hate that he lied. I'm upset. I considered leaving because he's lied before about other drugs before admitting to it. But I'm 14 weeks pregnant with our baby.
What do I do?

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