Need advice. I just found out that my husband has been cheating. I have evidence of a few lies and been very much betrayed. Leave or work it out?

Well you have two reasonable options. You either work it out and live the rest of your life with that on your mind. Or you leave him. I think the saying, "once a cheater, always a cheater" is very accurate. Personally, I would leave. Completely shun him.