Hi KathrineB
Sorry for the late reply, I haven't had much time to check the horary forum.
As for the delineation of the chart I would basically agree with what Raffaela said in her posts above.
I would only like to add something concerning your question about the other woman. I think that there is a possibility that he has someone else, though judging by the position of his significator he seems more into you right now. Mercury being in detriment maybe suggests that there is some trait of yours (of your character) that doesn't fit well with some trait of his character which makes him feel like he is repelled by you. I'm not trying to say that the problem is in you, it might be just that your personalities do not fit so well together and maybe that is why you were on-off all this time.
Now for the other woman.....the ruler of his 5th, which is saturn, is in his 1st house. This might mean that although he is not as much into her as into you, he likes her in a way after all because he let her in his house. Also saturn is retro, so this other person might be someone from his past who might be interested in him maybe until saturn goes direct again.
At the same time saturn is the ruler of his 6th (your 12th), so this person might be someone who is connected to his work or works with him, and there is a possibility that you are unaware of this because of the 12th house meaning.
Mercury in this chart doesn't apply to any planet, so maybe it is this other person who pursues him (again if saturn is taken as the other woman and in his 1st), and he considers her just as a fling and nothing more.
His thoughts are mars retro and in his 12th, so this might show that he does think of you, but not in an overt manner.
Venus, your ruler of the 2nd, applies to a square with mars in 4 units of time, so this might mean that you do not think alike, or do not share the same opinions about certain things (maybe about financial/material situation as the 2nd house is the house of money and movable things as well).
Keep us updated and hope that you'll get what's best for you from this situation
.
p.s. A wrong interpretation of an astrologer in my country is what got me interested in astrology in the first place, so I see what you're saying
. And being an ongoing horary learner myself it would be nice to read the opinion of someone from the experienced horary astrologers on the board concerning my delineation of this chart.
Blessings,
DoubleVirgo