I keep running into my ex boyfriend

Me and my now ex boyfriend broke up just this wednesday. it really took a toll on me and i’m still healing. it’s saturday night now and I keep running into him in public places, it’s so annoying. every time I see him I panic and act like I don’t see him. and then it’s just awkward cause I can feel him staring at me. i’m just not ready to see him yet and I hate that I keep running into him.. i’m trying to move on and seeing him makes my heart drop into my stomach. I was having a good day today and didn’t cry all day and then I ran into him and I feel like I was just sucked back to rock bottom. idk what to do. am I crazy? should I say something?