Can’t stop the hurt

I’m not going through a breakup but after finally moving on from my ex, I felt ready to trust and emotionally commit again. I let someone in. And my fears were confirmed, he messed with my vulnerabilities and fucked with my head. My mental health is bad enough as it is, now the one person who made me happy (or at least I thought so) is no longer in my life. Feels like I have nothing to live for. In need of tips on how to get over someone you have to see on a daily basis, I’m not strong enough to do it on my own and I’m sick of feeling like this.