It always seems like you fall for difficult types -- people whose intense emotions, like anger, jealousy and insecurity, end up directly affecting the relationship. Can the bond between you withstand the intensity? Often, the answer is no.
Strong, passionate feelings are important in a love affair, but when you never get a break from them -- when it's always up and down, up and down, and never any calm plateaus where you can just glide along and catch your breath -- that's when the relationship starts breaking down. No one has the stamina for that much drama, not even you. Jealousy, possessiveness and control are often issues between you and your lovers; you get into intense power struggles with them, and you may never be sure who's the 'winner.' A big part of the issue here is that you associate intimacy with struggle. Perhaps you watched your own parents go through this very type of relationship; perhaps you're just drawn to powerful people, and with power comes, well, more power. With this aspect in your birth chart, a smooth-flowing long-term relationship might not be possible -- but you might grow bored without all that drama, anyway!