Meanings
because of you (2nd person singular), for your sake
Das ist alles deinetwegen passiert.All of this happened because of you.
as far as you (2nd person singular) are concerned (you don't mind if); for all you care
Deinetwegen kann ich mitkommen?As far as you are concerned, can I come with you?
Examples
GermanEnglish
Ich wäre deinetwegen fast ertrunken.I nearly drowned because of you.
Tom und Maria sind deinetwegen hier.Tom and Mary are here because of you.