In a past life, you were closely connected, but the unfortunate thing is, it was probably as parent and child. That's not the best connection to be revisiting in the present when you're trying to strike up a romantic affair with someone, because that old feeling of a struggle for authority or a rebellion against it is still there between you, subtle but real. Your partner probably responds by trying to take control of the relationship in a way that makes you feel resentful or just rebellious.
If they say, 'We're going out to this restaurant tonight,' you respond, 'Nope, I want to go to this other place' -- and there you go. Arguments could ensue, or just feelings of resentment on both sides -- after a while, you both wonder, Why don't they just let me make a decision once in a while? Needless to say, this kind of challenging influence can really be a damper on the rest of the relationship, and it emphasizes whatever negative effects other challenging aspects might have.