1. 안녕히 가세요.(an-nyeong-hi ka-se-yo)
또 만나요.(ddo man-na-yo)
2. 맘에 드는군요.(ma-me deu-neun-gun-yo)
좋아요.(jo-a-yo) or 좋아해요.(jo-a-hae-yo)
3. 그와 함께 하고 싶어요. (keu-wa ham-gge ha-go-sip-peo-yo)
그와 함께 있고 싶어요. (keu-wa ham-gge id-ggo sip-peo-yo)
4. 난 니가 내 옆에 있어줬으면 좋겠어.(nan ni-ga nae-yeo-pe yi-sseo-jwo-sseu-myeon jo-ke-sseo.)
우리 항상 같이 있었으면 좋겠어. (wu-ri hang-sang ga-chi i-sseo-sseu-myeon jo-ke-sseo.)
5. 정말 or 참 보고싶어요.(jeong-mal OR cham po-go-sip-peo-yo.)
In a respect manner,add 요(yo) at the end.If say to friends, don't say 요.
In different situations,there are various ways of saying the meanings you gave above.Here I giving you are in common usage.
For your information. ^_^