Don't act like a jerk

When you find someone sad, and it's pretty obvious that he is, don't leave him alone, especially if he opened up his feelings to you. Don't go on acting like a jerk, ignoring his feelings even he told you "I'll be fine."  Don't leave him/her (reason for strike out being consistency - you have only been using male pronouns up until now) because if he was fine he wouldn't have opened up his feelings with you.  You'll say "I feel like I am intruding." Well, yeah you are intruding because he's your friend; he's family and you can't leave him in such a lame condition. Do me a favor Don't make him ever feel that he is a burden and don't fiercely show that he's inept at something show it kindly it's why he trusted you in the first place. (This last sentence is awkward and could be worded better)

Doing that with sincerity a lot of problems among us would be faced not necessarily solved at once but won't be forgotten. (Awkward. Maybe: If we acted with sincerity, perhaps we would not solve all our problems at once, but they would be addressed.)

Don't act like a jerk

When you find someone sad and it's pretty obvious that he is, don't leave him alone, especially if he opened up about his feelings to you. Don't go on acting like a jerk, ignoring his feelings even if he told you I'll be fine, don't leave him/her because if he were fine he wouldn't have opened up about his feelings to you.You'll say I feel like I am intruding -well, yeah you are intruding because he's your friend, he's family you can't leave him in such a lame condition. Do me a favor- don't make him ever feel that he is a burden- show kindly why he trusted you in the first place. 

If we did that with sincerity, a lot of the problems we face might not be solved but at least wouldn't be forgotten.

Well done! If you are interested, you can book an English lesson with me on my profile.