I've been studying the effects of Lilith for a few years now.
In synastry, I've found similar things. A guy's Lilith was trine to my Sun, I was very much in the passion for him!
I have with another guy, my Lilith opposite his Venus, and he is in the passion for me. Lol. So it looks like the Lilith person can be the object of desire. I have had another person, potential romantic, whos Lilith is conjunct my Venus while my Lilith is square his Sun. Nothing actually happened between us but alot of flirting and game playing, and it all ended badly, there was even another girl involved that took the biscuit for me. Another romance I've had had his Mars opposing my Lilith, I now realise partly why he desired me so much, yet his Saturn was conjunct my Lilith - so it was a push pull kind of feel, with me feeling a bit like a yoyo.
I've found another thing in non romantic synastry charts. My Sun has been opposite two different people's Liliths, both of them guys and totally non romantic. For both people, they drove me crazy but not with desire, more like total dislike. There were other factors in the chart where personalities clashed, but I'm sure the Liliths had something to do with it.
I have a friend who's Sun is square to my Lilith, nothing romantic. I found her kind of rejecting me in the end. I introduced her to my group of friends, only to find her somehow pushing me out.
Interesting point to study