i thought he was represented by house 5 because it was a romantic fling, house 7 is not always relationships, its a partnership. friends, long term relationships are ruled by house 7, house 5 is where it starts and then if everything works out well, then he becomes a house 7 question....from the nature of your question, i think he belongs in the 5th house i like to call "the house of recreational sex"
OK well, this is my interpretation, and the others are better, but i'm going to try and practice a little bit- His house 5 is Virgo, so both of you are represented by Merc- indicated by the Rx, shows when the two of you met.
Merc is in house 9 shows the long distance between you two
Good news is that moon is in Taurus, ruled by Venus and applying a trine to Venus indicating perhaps another shot at romance, or at least maybe a sexual encounter as Venus is in the 8th house of sex, sitting there with Jupiter
Edit: when Mercury is Rx and rules the querent, it affects the outcome because it means that the querent will change their mind regarding the matter when Merc goes direct- this is because YOU and HE are both signified by Merc and its Rx. wouldn't it be funny if he decides he wants a parntership with you- thus the moon in Taurus and by the time it comes around, he'll be "old news" when merc goes direct? so typical. This is a quote from Barbara Watters, I looked up the Merc Rx for the querent- "ideas which seem brilliant while Mercury is Rx show SERIOUS FLAWS when it turns direct"
Mars is also in your first house and Venus is separating Exact from mars, an inconjunct...wondering if an indication of the past relation?
the 4th house rules the end of the matter, saturn is there, a malefic, but the POF is also there in HIS sign, Virgo, so i think you can get him, but being that mars is a co-significator w/the pluto opposition i think there are some problems?
I think you will see him again, the other postive thing is that his 7th house has the moon in taurus, ruled by VE, so maybe he does see you as a potential partner? Mercury IS applying a quincunx to the POF in house 4. in the horary book i was reading by ivy jacobson, it says the Quincunx shows the querent will support the other- you are in medical school, right?