Sorry if you have experienced this.
I would think it’s difficult to ascribe such a behavior to a single aspect in an individual’s chart, and then too the person’s chart has to be looked at in context, with the charts of partners.
My partner (and Co-parent of our three children) has Venus conjunct Pluto in the 8th.
I suppose he was difficult to pin down before our marriage, and chased by many women. It’s hard to say what anyone else’s relationships are about without being one of the people in it, but his exes completely adore him even now. It’s a good thing I am not jealous!! So I do not think it’s possible there was too much negativity between them. That said, my Saturn conjuncts his Venus-Pluto conjunction, so it could be a matter of chance after all that he married