Dear Sagittarian fellow,
please keep in mind that I am new in horary but what I know for sure is that you are Jupiter and he is Mercury.
You are in your 12th house (not a very good place to be), he is in your 3rd of communication but since he is less than 5 degrees from the cusp, he is interpreted in your 4th - his turned 10th house.
Moon is your cosignificator and also the outcome.
Now, if I am interpreting the future moves of the Moon (the outcome) correctly, Moon will trine Mercury and then will trine you (the Jupiter). Also, you have Uranus in your 1st on angle, so, an unexpected event is possible. Moon also rules your 5th of romance.
He is very strong in Gemmini, he is in terms of Saturn (Saturn rules his 5th of romance and flirt and also his 6th of every day job) so, he wants flirt (as far as I can see).
You will also make a trine (and again - if I am interpreting this correctly), so, it is antoher yes for having a relationship soon. (How soon I don`t know how to answer).
Wish you the best