How to move on from a breakup?

Me and my ex broke up on Tuesday. He cheated on me during the relationship and I decided to stay and give him another chance because I did and still do deeply love him. He became distant so I asked him if he wanted to be single because if so I’d be willing to let him go for him to be happy. He said yes he wanted to break up and that we are over. He came over yesterday to pick up his stuff with no emotion at all. I feel like I’m a mess and feeling the pain for both of us. The worst part is that we work together so I’ll have to see him everyday. Tips on how to move on from this? I feel so lost and hurt. I can’t even eat. I haven’t eaten anything since the breakup.