Notice him as mercury almost exactly between Venus and Jupiter.
He is playing both sides.
He is in his 2nd so he may be doing this to boost his self esteem.
Mercury in the chart is just about ready to go retrograde, so it won't reach you, Jupiter or Neptune.
Mercury on the other hand will complete the sextile with Venus.
But almost immediately mercury goes retrograde, backs away. To where? To opposition with that Uranus that imposes independence.
Mercury and Venus will no longer aspect each other.
But once mercury turns direct, and begins moving forward, it will make a sextile with Jupiter! So, after wavering and dillying around it looks as though he will return to you.
So, in effect the answer to the horary question, Will he leave me for her?, is yes and then no.
You might want to do another chart further on to ask if you will be together. Wait until it pops spontaneously into your mind.
In addition, you could do a synastry, composite, and progressed charts.
These would all give you more insight into the relationship itself.
Don't give up yet, and don't go into crisis. Just be patient. After all, it is mercury, him, making the moves, not you.