Why would he do this?

There is a guy I know for a long time at work and we always understood each other and have fun he even offered me a massage in the past. But sometimes we fought too and when he tried talk to me I would ignore him then he would chase me around at work. Last week he fell sick and I go buy ingredients for making a tea against cold for him, I tried give him Wednesday the tea he rejected which hurt a lot but I accept it. Then the next day I wasn't at work, and this guy go and tell my boss that I made tea for him and saying other bad things about me like bringing up a mistake I made in the past. Then Friday he didn't come to work which was weird to me that day I asked all my coworkers why he didn't come and what happened they said he just wanted a day off. And today I wanted to go to work and my boss said everything this guy said about me and fired me I just don't understand why he react that way when I wanted help? This isn't normal and im still shocked we were normal that Wednesday with each other then after the tea he started behaving like this and tried for me to get fired

Why would he do this?
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