-----I'm searching for these two manga's at the moment,

obviously there's major spoilers to the plot so if you don't want to know don't read.*

First, college girl with a twin brother (who despite having a girlfriend has a major sister complex). Runs into her old highschool flame who was a rising idol but washed out due to his personality. She's a senior and he's a freshman now despite him being her senpai back in highschool...He's all like 'i know you still love me'and she is all pissy at first and then her brother starts getting in the way and being a dick. Towards the end the sister pretends to be the brother in order to dump his girlfriend for him all the while the bro does the same thing to her boyfriend behind her back. It ends with both parties being like I knew it wasn't the right twin and some fluff like that.

Second, this girl has a boyfriend/ fiance she loved then goes to a highschool reunion and runs into a guy (might be her boyfriends friend) who she went to school with who scared her. Well he shows up at her place scares her cause he's like 'don't just open your door' they do it and start having an affair. I remember a scene involving a public restroom on her break. I think the boyfriend finds out and pretends to go along with it till she backs out of seeing his parents and then snaps and calls her a slut of something. The other guy saces her, it ends with her funding a photo of her not looking and saying something like "I know if I ask he wouldn't give me an answer." Please and thank you!