So this manga has a pure innocent uke, basically he is from countryside and when he moved to city a guy showed him the city life and all and eventually they were together but this is only a one sided love from the uke's side as that guy didn't give uke attention, love and cheated which the uke didn't know about and he was becoming more insecure thinking that it's his fault, now another classmate who has black hair took a liking to uke and his innocence, uke works in a convenience store and he meets that guy again. The seme was trying to make uke fall for him and move away from the toxic relationship he was having with that guy. That guy was soo ignorant that he left uke in fever but mc(seme) goes and take care of uke. That guy suspects their relationship and to show his dominance he dragged uke to a park washroom and came out about his cheating and raped him, he left the uke there like that but the mc came to save.
I am finding a BL manga I read some days ago but can't remember the name. Description: the manga is japanese and it started with the uke living with a guy, uke is from country side so he doesn't know much about tokyo lifestyle. He came to Tokyo and that guy caught a hold of him. Basically uke loves that guy but that guy finds uke boring and lives his nightly life alone, uke being too pure to understand was devasted as he thought it was his fault for not satisfying that guy, but his classmate who is black hair knew about all of this and was aiming for the uke, he loved uke and was trying to get him out of that abusive relationship. The seme here kind of tried to get a way with uke sexually but that guy found out about it and he was furious and raped uke in a bathroom stall and left him there. I forgot after that.

this manhwa has 3 main characters aka its poly. so there is this uke who reaaly loves the ml who is a celebrity (I dont really remember) but this Ml went away for some work and found out that he was being stalked by another guy. now this guy is the 3rd ml, i remember him being the talest, dark skinned and of calm compusture. the ml i.e. the actor caught him and had a convo with this gut and got to know that this guy not only did stalk him but also the uke and wanted to be with both of them in a relationship. the ML tried to be with him and after coming back from the tour/work trip, he brought the guy with him home which left the uke flabergasted and uke was not able to take it because he thought he was being taken advantage on and getting cheated on, but slowly he was adjusting and one day again the ml was out and the second ml and uke had a close moment but this time the ML came back from shoot ig? and he heard them from outside the door and sat there with insecurity even though he saw it coming. now when the 2nd ML came out of the room and saw him, he was taking his luggage and telling him to get inside, ML proposed to break up and go back to the usual relationship with the uke. [I read the story till here as it was still uploading and i can't find this story anyore]. this was a coloured manhwa btw
Let me know if you find it, I recommend trying writing parts of the title if you remember some, or if you're desperate go to the yaoi section (it's automatically the newest updates or choose the newest added) and manually search back
The shape of us