Please I need advice

I think my manager is slowly trying to build a case against me in order to fire me. Im a good employee and all my supervisors love me . Im not sure why my manager has an issue with me. Ik he has an issue because of his actions because it definitely feels targeted and I don’t think anyone else is going through what I am. I feel crazy because it’s so hard to prove it. Like is he racist or something? I spoke to my supervisor about it recently and he came up to me last week saying he sees what im talking about . Something odd happened today and I really need someone to tell me my rights and what this means. I got an email from my manager saying that the last two weeks of December my employment will be deactivated due to the slow period and afterwards he will look to see where I fit when I “come back”. He referred to me as an “on call “ employee. Mind you I’ve been working for them for 3 years full time then in September i became part time 1-2 days a week because I returned to school. I’m not sure when my employee status even changed. I think hes trying to terminate my profile as a way to terminate my employment temporarily. Is this a way for them to avoid severance if he chooses to not have me back? Is deactivation the same as firing someone? If he does this and I return does my employment reset? Because in Canada u can basically fire anyone without cause if they’re new employees. We finally got an HR last month and I wanna talk to her about this and how I feel about my manager. Is this even legal? Was it the HR idea? Should I just shut the fuck up and start looking for a job? Please someone tell me what I have to do. I need to be on steady income for my family. Im so tired of the way hes been treating me. Also there was a team lead that yelled at my last year and I stayed quiet about this. I found out recently my manager knew about it and didn’t even right this person up or say anything but when I was 30 mins late to work last week due to bus issue he gave my a written warning . Should I bring that up? Again I feel like so many things are hard to prove. Thanks for reading this far