The main guy lives with his girlfriend but never had sex with her. Instead he always have sex with his classmate that enjoys it and tries to manipulate him. He also have sex with some other girl i believe she had pig tails. His girlfriend has short hair. The girl he cheats with a lot has long black hair i believe. When they went to the beach he almost got caught having sex and his girlfriend pulled out a knife on him but she passed out and forgot about it.

I believe when i stopped reading it it was around chapter 15. Im not sure if there are more or not. Thanks for the help

Uwakoi and I don't think it has been updated much since then.

Sounds like Uwakoi but it's still at chapter 15, no updates yet.

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Thanks and yeah it is Uwakoi. Yeah it seems it hasnt been updated for a while.