Chasing for 3 years - Couple for 3 months - Breakup and Alone for 3 months

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My best friend had chasing a girl for 3 years. This girl is very pretty, and had never been in any love relationships before, and so was my friend, my friend's personality is just so-so and he runs his own store. Many handsome and riches guys had been trying to attract her and make her as girlfriend, but no one succeeded. With our help from friends, my friend is the lucky guy who got her 3 months ago after a long run chase, and he was proud of it. They committed their love relationship 6 months ago. The first month, he was the happiest ever, always smile when I met him with or w/o this girl. I was busy on those months, so I never get a fresh news from them anymore. 3 months ago, he came to my house with a bitter face. He said he had his g/f broken-up. That was shocked to me. Then I tried to talk to him about the girl's reason. Nope, all reason from the girl is too typical to me (this I heard from my friend). Then I tried to contact the girl's best friend (the one who was helping make them couple) trying to get an information from the source, girl-with-girl talk is better. I got it, it's the same with my friend's explanation. It was my busiest time at this round, so I told other friends to talk to him. Then 1 month after he had his g/f broken, the girl's friend told me, she already committed with somebody else, and they looked so tender-hearted couple on everywhere. She said, their tender-hearted is never seen as the same as with my friend's. The worst, this news reached to his ears. Now, he everyday lives just like no mood, never smile, and always locked him inside his home. I and other friends tried to ask him out for friend's talk or going for a walk. But he softly rejected our offerings, with several reason, tired, no mood, etc. Tried to visit him, he talked, but not much, he is closing his heart to anyone else, including his relatives. It's been 3 months until now and he is still same like this, we are worried about him. Do you have any suggestion, me and our friends had tried to talk to his parents and relatives, but no effect. Any help is very appreciated. Thank you so much.