I [27F] refused to help my friend [28F] cover her affair with our boss [49M]. Now her husband [31M] is harrassing me.

My friend and I work at the same company, while we work on different departments the company is on the smaller side so everyone knows everyone. A while ago I noticed that something was going on between my friend and our boss. He's a very nice and charismatic man, he's also very good looking and it's known that he has had relationships with employees in the past even though he's married. I didn't think much of them together, mostly because she's married and I never expected this sort of thing from her.
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The rumors inside the company started pretty soon after that and they reached me before she had even told me anything. When she learned about those rumors, she came to me asking for help. She came clean and told me they were dating but her husband could not know about it. She wanted to use me as an excuse for when she needed to go on dates and even suggested that I should take the blame as the mistress so our colleagues would stop talking about her. I obviously told her that I wasn't going to do that and she got extremely angry about it and we stopped talking soon after that.
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After that I started receiving messages and calls from her husband asking me to "stop slandering his wife", because aparently she told him that I was jealous of her improvement inside the company and was spreading lies about her to get her fired. I managed to block his number from calling and texting me but he has sent messages through social media, including accounts that belong to her. I thought about telling him but I don't think he'll believe me and I'm scared that she'll do something that will end up with me losing my job.
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tldr: I didn't help my friend cover her affair with our boss, so she told her husband that I was harassing her and spreading false accusations around the company because I was jealous of her improvement. Now he keeps calling and texting me, telling me to stop. I don't know what to do and I'm scared of doing something that'll make me lose my job.


Source.