What to do in this situation?

Should I tell my boyfriend I was thinking of another person the other day he is not a jealous boyfriend and he doesn't care for me having male friends either but in this situation this guy I was thinking of was someone I talk to a year ago and some months even before I hooked up with my boyfriend me and this guy had a flirting friendship or whatever u want to call it but use to tell eachother a lot of things we lost in contact though
Tell boyfriend
Don't tell him
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What to do in this situation?
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