Should I bump into him or forget it?

So this guy I like and I always say hi and he always says hi to me first with my name and finally he actually had a conversation with me for once last week at night and he was so smiley and all and actually he made an effort to talk to me after I stopped talking and he stood there talking to me even tho he was done with work and was going home he still spoke to me and then after like a few days later he walk past me saw me but didn’t say hi I said hi I didn’t hear a response all I saw was his mouth move a little but he didn’t say anything and didn’t look at me even so I’m thinking he just isn’t interested and this whole time I was just tweaking thinking he likes me and today I have to go to work to get some stuff but I don't know if I should make an effort to bump into him or just back off and not be annoying please I need help people😭

Should I bump into him or forget it?
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