Let me clarify this information for the confused pure folks of Mangadex: NTR in the title means Netorare and Netori. The act to stole other's women by sexual mean is called Netori and the reverse where other people stole MC's women also by sexual mean is called Netorare.
So the act of stealing other people's man or woman not by sexual mean (rape for example) but by others mean like using money to bait gold digger for example, it can't be called Netorare or Netori.
Both Netorare and Netori applies to MC (yes the MC, not the best friend. Best friend bro is not the MC).
Usually if a story only have one element, be it Netorare or Netori, the title will have it in the name. A make up title for example sake: I Will Netori My Classmate's Girlfriends. Unlike this manga title which uses NTR that have dual meaning.
If a story uses NTR in the title, it means the story indeed have both Netorare and Netori elements in it.
I'm not proud to have this knowledge.
And this is not a spoiler, mind you. If you think this is a spoiler, then all manga's title in Mangadex are also spoilers and shall be banned from Mangadex. Idiotic right?