In reality- nekham don’t need any support because ekam does not care about anyone else. If nehmat said yes, he would marry her today. maa- behen jaaye bhaad mein.
It's a love triangle, so Ekleen's relationship needs to make sense, and Harleen's affection for Ekam should be something that goes beyond filmy romance. Also, today’s scene made it clear to the audience that Ekam is not using Harleen.
As far as I see, Harleen has gotten a personality upgrade recently. It is very similar to Nikhil's change. So ultimately, Nikhil and Harleen will be the people who support Nehkam.
nehmat is just as blind about him but since she is fl she can’t ignore others.