The first guy who gave her the scarf on train station is the same guy who is the male singer not the other. Then it pulled into a frame where he is holding the scarf and then drops it (circling back to the end and the beginning of the video). You are right though, the other guy is jealous and is friends with the singer.
Can i ask you a question: do you watch the video before and then react or is this the first time you see the video and react on the fly. nice reaction.
There are three guys, one lead singer Maanu, other antogonist who is scheming to break them up, but pretending to be their friend. He makes Maanu think lead singer Annural is being unfaithful to him with 3rd guy who we also see leaveing her room at start, but in actual might not know how it and how it looked, i.e. be there wrong time wrong place situation and may only be a colleague/friend. Antagonist uses that, even puts scarf Maanu gave to girl in 3rd guys room, we can see his pic next to chair from where Maanu finds scarf thinking she gave to him (beside it having emotional value), in actual she left it on her seat when taking stage to sing. Another female who maybe her friend and observes it, and tells Annural same, who goes after him, but she is too late. I guess thus kind of 70s era in video otherwise u can always call ;)