Why does my ex still wear the bracelet I gifted him?

we were together for 5 years and it has been almost 2 years that we broke up. after break up we didn't talk for 9 months and then he texted me on my birthday saying I hope you didn't think I would forget today and now we just text each other for birthdays and stuff. I moved to a different city after break up but he is friends with all of my friends. I have been seeing his pix with friends and in every single pic he is wearing the bracelet I gifted him, doesn't matter where it is he is always wearing it. it really bothers me because I threw out everything he had given me even though I liked all of them but I just didn't want anything to remind me of him. but seeing him wear it bothers me. is it not a big deal for guys?
Why does my ex still wear the bracelet I gifted him?
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