I find that Aalekh/Sadi are two lost souls, that have found each other (like in their first scene together) to get married to but a deeper love & bond will develop after marriage (i am so hoping)
As we know Aalekh is unwell, and from what i can see, he's separated from the family there's no closeness, only he has his Choti Ma - deep down Aalekh looks lost and alone, and needs a companion, coz we know Choti Ma cant do what she is doing right now all her life
Sadhna is a sweet simple innocent girl, who's basically parentsless despite having Mamaji and Mamiji but there was always that missing part. Right now very much alone and lost just like Aalekh - and someone to call her own etc
From what i see and can tell that Aalekh/Sadhna have found each other, got married, but with really no relation between them, but its that big parvitra bandhan that as made them one now - hopefully as time goes on we will see some relation growing between them, be it a friendship or more
As a wife, i am so sure Sadhna will do everything to get Aalekh cured, help him, take care of him, protect him etc - its her dharm as a wife to do that, she will be the one to make a difference in Aalekh's life - and once Aalekh is well and realises what a big sacrifice Sadi made, he will be honored to have her as his wife 😳 - and loves and respects her 😳 etc
As a Bidaai/Salekh fan it will be a real treat to watch them in their journey in marriage (esp how things are right now) and fall in love in the future - creating a deeper bond between them 😳