for my own good!!!

Hi I am liking for the first you manga Ithat I read 7years ago but I don't remember the name of that much about it. I only remember that it was a guy that dated a lot of girls and every week or month don't remember exactly, he dumped them. His friend told him what if they try to go out. Also I remember that they where in the room of one of them and start kissing.
Please help this is for my inner child from 7 or 8 years ago.