Minderwiz
Interesting. Early March is his Birthday. On St. Patrick's day that month we booked a two week trip to Hawaii to visit my brother, left the 1st of April. That was the firs time that a family member got long term exposure to what he was really like. He's a serious alcoholic. I felt safe around my brother and my ex couldn't go to extremes, at least in his behavior towards me, because of this. I got fed up with how things were knowing that things, at least for me, could be so much better. My health was suffering from the stress of it all. I can remember going to the top of a dormant volcano on Maui to watch the sunset. Magical moment there. Probably embedded in that experience was an important mental turning point in my decision to leave, though it remained unacknowledged until later that year.
Even more 'interesting' is that as you have an Aries Ascendant, your seventh house cusp is in Libra, ruled by Venus. Venus is therefore a significator of your husband/partner (not the only one but an important one). During this period in 2009 Venus stationed Rx in the sign of it's detriment, so it was debilitated both essentially and accidentally. The second conjunction with Mars occurred in the sixth house of the Return Chart - making Venus even more debilitated.
Debilitated Venus often signifies excessive drinking, drugs, or adultery (though not particularly all at once). At that time your alcoholic husband is clearly signified prominently in your life. Whilst Mars is a significator of violence (and it may be here as well) it's also a significator of action and doing things, often with a sense of urgency and drive. This does look like an astrological event that mirrors your need to take action relating to your husband's behaviour.
There were signs of a change in relationships, as a new period began on 1 July 2009 and lasted for a year before there was a major change. I would guess this period covered the formal break up. As the period was ruled by Jupiter, it looks like it was beneficial to you, though it might not have seemed so at the time. A Capricorn sub-period began on the last day of July, 2009 and Capricorn is your MC. The MC is not only associated with career, it has basic associations with your public actions and this particular sub period was the time you moved out.
Venus doesn't always have to signify your husband/partner, as it also rules your second house and in your natal chart Venus is not debilitated, far from it. It's just that for this period of 2009 it actually was signalling that change in your life.