hi! try these:
http://www.mangago.zone/home/mangalist/800775/
http://www.mangago.zone/read-manga/shokuba_to_jitaku_de_gyappu_no_aru_papa/
http://www.mangago.zone/read-manga/that_girl_is_not_just_cute/
http://www.mangago.zone/read-manga/couples_twitter/
http://www.mangago.zone/read-manga/secret_love/
http://www.mangago.zone/read-manga/blackberry_chocolate/
http://www.mangago.zone/read-manga/ai_boyfriend_and_unpopular_doctor/
http://www.mangago.zone/read-manga/a_story_about_a_totally_straightforward_girlfriend/
http://www.mangago.zone/read-manga/nenene/
http://www.mangago.zone/read-manga/yin_yori_danjou_wa_nakanaka_susumenai/
hiii so idrk if you'll like them but you can try ''mainichi kiss shite ii desu ka'' but you'll get diabetes for sure
''honey lemon soda'' is nice! the male lead helps the female lead in many ways and its not toxic
hmmmm ''boku ni hana no melancholy'' is cute! male lead has a sad past but its not toxic in my opinion
(they are all shoujo cute mangas though i hope you dont mind)
or maybe you can try ''toy complex'' its a smutty manhwa that isnt toxic imo
''i found somebody to love'' is a manhwa with a healthy relationship!!
and finally if you really really want something sweet and healthy and beautiful i'll recommend killing stalking ;)
Pls I need some straight healthy relationship mangas cause all of them I find are sooo toxic :( and I literally only read yaoi!!!!!