I understand that everyone wants her to know that it is haram etc and what the Quran and sunnah says about it...and im sure she already knows this
But a few of you are coming across very harshly towards the sister, which can in actuall fact can push her further away from islam and more onto him to get away from being judged and spoken to so harshly.
Nobody here is perfect or pious, we all sin in some form or the other and may anger Allah knowingly or unknowingly, the doors of repentance to Allah are always open if there is emaan in the heart.
The sister clearly knows its wrong but is oviously going to find it difficult to leave or walk away from somebody who to HER she loves and finds happiness with, she clearly does not want it to end and would rather be married to the guy in a halal manner
Sometimes people need to take a down to earth approach when giving advice yes mention Quran & sunnah no doubt but also try to be understanding to her situation and try to think and feel how she does in her situation
The harshness is what drives people away from the deen and further into haram...
"this is haram your haram etc etc" yesss they knoww !! So help them understand in the best way possible while being empathetic to their situation, while remembering that you yourselfs are not perfect and to hold off the judgy tones
We should all be encouraging her and helping her emaan raise, and maybe one of the brothers could speak to him and befriend him and help him find islam
they're just speaking the truth, it might come across as harsh but they've spoken the truth
there's not really many ways in saying it