What should a guy do?

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hey guys, i wanna have your opinion on this. Suppose a guy is deeply in love with this gal.Now ,as is common with many of the guys, he doesn't wanna loose her.So he cannot tell her that he loves her. What are the ways in which a guy can indicate a girl that he loves her rather than saying it. What gesture , what act will give the girl an indication that he might be in love with her? And what act or gesture of the girl might indicate that she is interested in him too??? any girls out there, i need your opinion !!