
I think I can recommend you over 50 lmao
Here are a few:
1. 10 years where I loved you the most
2. At the end of the road (happy ending)
3. Killing stalking (its more horror but the ending has made every reader cry)
4. Banana fish (watch the anime)
5. Round trip to love (watch the movies, it has 2. There's also a manhua but the translation is awful and the manhua hasn't been updated in ages, you can even read the novel) (happy ending)
6. Sissy (happy ending)
7. Black lotus (happy ending)
8. Replacement (happy ending)
9. My childhood friend was a god
10. Marionette (Cereal) (Yaoi)

If you want specifically with trauma from past here are a few recs:
1. Ten Count
2. Mobius strip
3. Sora o Daite Oyasumi (Yaoi)
4. Zankoku Na Kami Ga Shihai Suru HIGHLY RECOMMENDED
5. Six sex
6. Ashitagari Mono Mania
7. Yoru no rakka
8. OUROBOROS:ウロボロス HIGHLY RECOMMENDED
9. Back to School HIGHLY RECOMMENDED
10. Kiraide Isasete (Yaoi)

- https://www.mangago.zone/read-manga/the_specific_heat_capacity_of_love/
- https://www.mangago.zone/read-manga/kosha_ura_no_natsu/
- https://www.mangago.zone/read-manga/ashita_shinu/
- https://www.mangago.zone/read-manga/seto_no_omise_no_okyakusama/
- https://www.mangago.zone/read-manga/hypnosis_mic_hoshi_ni_naru_made_doujinshi/
- https://www.mangago.zone/read-manga/kuroko_no_basuke_dj_13_centimeters/
I’m trying to cry myself to sleep.