Ok so here’s my take on this storyline
Raghav finds a recording of his ex. His face gets soft as he remembers then on to anger and sadness so she obviously meant a lot to him.
Then the saag so she cooked for him which means they were intimate and together as a couple. He is honest enough to tell pallavi about it and she didnt want to hear it as she doesnt want him to scratch old wounds. When pallavi walks away he thinks she is mad and is walking away and he quickly reassures her that even though that girl ruined him in trusting women, she (pallavi) made him believe in love. So we know he loves Pallavi.
(Also we know from his past dialogues with Farhad that he has never loved anyone maybe liked, slept with etc but never loved. He had said once that love and him are 1000 miles apart or something like that)
During his confession to pallavi he said he doesnt let anyone in so to me pallavi is one he has loved. In my opinion the only one. To him pallavi means love.
As for this girl, they might have shared a life together but i dont think he loved her.
So judging by her being scared of his name and then dropping the samosa plate means she has done something to raghav in the past and she fully knows she has to face his wrath so it’s something big.
So from the recording she wanted to marry him which means they were close enough.
Ok so either she left him for money and career (something raghav kept saying that women are after him for money)
Together with above also could be she was pregnant and aborted child without telling raghav. He finds out and is angry.
Third reason, she left him for someone more rich and powerful. (Now this i dont know because she seems to care for him when she says his name even though its in fear)
These seem cliched stories so that would apply in classic itv serial. Mhrw usually is different so hope they have come up with something different.
I dont think there is a child anywhere as bringing in a child actor on set during covid times will not be feasible.
I think all this drinking is due to this girl. My opinion. I mean she must have been the trigger and he resorted to alcohol to numb his pain from his past. He might have even moved on from losing his dad and brother when he met her and with her betrayal or whatver she did, he was devastated and drowned his sorrows in alcohol. So since long he now uses alcohol to deal with his pain. Maybe with her back, there will be some closure to that and his drinking will reduce when he realizes that drinking doesnt resolve anything. And pallavi will help him with that when she realizes how it all started.