@TM - Firstly, thank you so much for your insightful post! It has gotten me to reconsider a few things about the previous episode.
I feel like others will be able to hold a more decent and insightful conversation with you than I can, but I would still like to throw in my two cents.
1. Is HS' love conditional?
No, it's not. He never expected Babes to love him back. He would have been content from loving her afar whilst maintaining a close friendship with her. Furthermore, he knew that Babes is not on the same wavelength as him when it comes to marital maturity. He has experienced all the ups and downs and knows how to navigate through the complications. Babes on the other hand, never really got that opportunity. To expect her to hasten her speed and reach his level is foolish. It will take her time and that's exactly what he had wanted to give her. It's also why I think he was wanted her to make the first move. He would always be ready for her, it's just a matter of if she's ready for him. Given the way the current track is proceeding, it's safe to say she's not a 100% there.
2. Why does it hurt him?
Him understanding Babe's position doesn't exempt him from feeling hurt. Just like the underlying reasoning behind HS' words didn't spare Babita from feeling offended, similarly, HS too, has the right to feel hurt whenever she speaks or acts harshly. You can't feel emotions in their singular format. There's always a mixture of other elements involved. When he made that poison comment, he had assumed that he would be all alone in it. Lala and Naeem Bi are there, but there's only so much that they can do. Besides, he can't involve them in all his marital problems. There will be some things that he will have to handle on his own. As for Minnie, his love for her prevented him from sharing his concerns with her, but being his true daughter, she had figured it out and informed him she's on his side. He had wrongly assumed that he would have to drink the poison alone because he's not alone. He has his brother, mother and daughter on his side, willing to help him out whenever he asks.
3. He doesn't want to change Babita.
No, he doesn't but that doesn't mean she won't. Babita is her own woman, undergoing her own journey. There are still some things that she'll have to figure out on her own, and that includes making some mistakes.
To believe that someone won't change over the course of their life is foolish. Heck, even HS himself has changed since Imarti died. He's not the same HS when Imarti was alive or before they got married. In Babes' case, it hasn't even been a full year since the whole Ashok fiasco went down. There will still be a lot of emotional entanglements she'll have to sort through before she can become stabilized.
4. HS kept his ego aside and apologized with folded hands.
As you mentioned, it was his choice to apologize this way. I can't really describe it since although it symbolizes a sincere form of apology, it also demonstrates the power dynamic. In this case, Babes was in power while HS wasn't. However, I don't really think he had an issue with this per say. Usually when one apologizes, the expectation is that all mistakes are forgiven and the wrong doer is now accepted with a clean heart. But that's not really what happened her. The apology, while it had held the potential to be sincere, got morphed into something ugly. It became a choice, a test which will decide how they live their lives going forward. If he hadn't apologized, then I don't know if Babes would have gone through with the wedding. If she did, then it would have been filled with a paranoia that one day HS would mistreat her like Ashok. But HS apologized and essentially told her that he would always choose her no matter what. Of course, we know that's not true as he too has his own limits, but that's the message that was delivered to Babita.
5. Other thoughts.
I don't know if I would go as far as saying that HS overreacted. I will have to rewatch the episode to see if I concur. That being said, both characters have acted in ways that has hurt the other a lot. Regardless of the intentions, or the stress factors that triggered such behavior, pain was delivered and felt on both sides. It's in the aftercare that they have fallen short and need to work on now. For that to happen, they need to communicate without any third party interference. If they keep neglecting their issues or keep sweeping them under the rug, it's going to blow up in their face in a very ugly manner.