First job😬

So yesterday day was my first day at work ever and this guy I used to have a thing with is starting back to well he added me for work purposes since we all have each other’s Snapchat. Well while I was watching videos for training he came in and sat down and I could feel his eyes on me and he came through the drive through where they put me on my first day. That night he texted me saying how he missed me and that he wanted to take things slow and see where is goes with us since we’ve always had a thing..I guess I’m kinda scared since we’ll be work mg together and he has a history of cheating😬😬 what should I do

That’s just a picture from work when I was on break😂😋