I want to have sex with this girls boyfriend
Why do you want to have sex with him?
I think about it every day
While it can be difficult to ignore urges, it is important to not act on an urge with someone in a relationship. This would be cheating for that individual and you do not want to be the one to ruin a relationship.
I know they're together but they talk as if they aren't a couple. He is flirting with me. I just want to have sex with him.
I understand that you are attracted to this person, but it's just gonna cause nothing but problems if you sleep with him. you should reconsider.