I'm still learning, but I'll give it a go. I'm not a professional (yet) but I'm decent at this.I actually find your synastry really interesting.
It looks like you have some significant nodal stuff going on; his Jupiter exactly conjuncts your Moon on your NN, and your Jupiter is on his. Is his NN in Sag? If yes, Jupiter rules his NN. This DW is pretty significant. It's also casually interesting that his NN is in Sag 8H whereas your NN is in Scorpio 9H. You have similar destinies.
You both will help each other grow and think bigger. This relationship may help both of you expand, and your horizons will be much larger as a result. You may travel together, study together, or philosophize. At any rate, this relationship will feel very significant.
Your Venus, Jupiter, and Pluto fall in his 8H (arguably your moon, depending on housing systems ?? Even if not, its in his 7H. That's a DW too.) So he will be very deeply affected by your presence. It may be very easy for him to lose himself in this relationship. This will be a big one for you both.
Likewise, he have a sleuth of planets in your 12H. He will have a strange impression on you. He most likely feels very familiar to you, but in an intangible and ghostly way. This is most likely a fated encounter.
What is interesting is that his Saturn and Mercury square his nodes. This is called a "skipped step" and it is something that he really need to work on in life. As your Saturn is there too (plus considering all the 12H/8H activity) it is very possible a past life relationship with you contributed to his karmic baggage, and your Saturn is a "key" in overcoming it.
It is opposite his Virgo 5H Chiron. In this case, its possible he feels like your ideas aren't worth considering, or maybe he self-censors to an extreme level. This restriction directly prevents him from self-expression. He needs to learn to use his voice.
Strangely, Mars rules your NN (with Pluto, which is also on his NN) which is opposed his Mercury and Saturn; your Mars also squares his NN.
With this, plus your planets forming a T-square with this opposition, I am guessing you are here to stimulate him to work on this. Overcoming your inner critic is paramount to his evolution. This may or may not be a romantic relationship, but you can help him with inner growth.
It is also very important to remember that this is up to him. Your presence is here to MOTIVATE him to help himself; you will not magically fix him.
EDIT: oops, got the people backwards. I think I fixed it!