My best friend got rejected by a girl and now he's different?

Anonymous
He really liked this girl and they would hangout together all the time. They would even have dates together and this went on for a period of 3-4 months. He then asked her out and then got rejected by her which I was really surprised by, he took it well and they hung out a lot less. He did seem affected by it also (this was like 5 months ago). I asked him whether he was ok and he just said he was fine. He then started to work out more, we don't really hangout lots anymore. A couple months later he hangs out with different friends and they're not exactly nice people 'players' as people call them and he's got a girlfriend now not that girl though. Is there way to revert him back or is it too late?
My best friend got rejected by a girl and now he's different?
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