I think there is some cultural context to the "born without love" phrase, fwiw, but I couldn't dig up the relevant link. Hopefully someone else will.

Here is one of the threads I have saved, and here is the second. I vaguely remember a third, but can't find it right now.

So in that case, his pursuit of Zhao Yunlan is probably because Shen Wei told Zhu Jiu not to touch him, right?

Yeah, and also because he's the Envoy's ally, which Zhu Jiu would know even without Shen Wei having warned him off, but if Zhu Jiu passed the info on, the warning definitely drew Ye Zun's attention!