I actually want to know about Om Riddhima love story

I mean we know how main leads love story will start
but what about existing love stories?
For example:Shivaya openly declares that Tia is perfect for him (reason some big deal in business)
So basically its just business not Love at all .
In case of Rudra we all know till now hotness matters for him and thats it.
Both Shivaya and Rudra don't look emotionally involved with Tia and Romi respectively.
But what about Om ?
He looks so emotionally involved in Riddhima.
How in the midst of his issues with dad,art,brothers's love, drug issues he met Riddhima and was sure that he can trust her?
At least Tia is very rich for Shivaya so there was a point of contact-Richness, and lineage
For Romi-she is just shown as flavour of the month for Rudra
But Ridhhima-How she met Om?What's her background?
Its it ever mentioned about Om and Riddhima's love story?
How she became his emotional support during his crisis time?

i am curious too. since riddhima pretends to do social work she must have met him during his drug issues maybe rehabilitation centre or something. he thought maybe how caring she is towards other people in problem. i don think he knows her that well since they were in a long distance relationship. todays epi proves that as she didnt notice the plants he had for a long time and she wanted to change things in his room. its weird how he asks shivaay whether he is in love with tia when he should ask that question himself about riddhima.