In looking at this man's chart, I think you have to take him at his word. A bad break-up should give a person pause about starting the next one, if he's mature enough not to simply want to grab someone else on the rebound to salve his wounded pride.
With his sun-Uranus-MC conjunct in freedom-loving Sagittarius, this man does need his space, moreover. His Scorpio Venus isn't badly aspected and conjuncts his 7th house ruler Mercury, suggesting that a solid relationship is important to him. But with Saturn sitting on these planets plus his sun, and closing squaring his AC (another real "me" point) he may either internalize the idea that love will disppoint him; or else that (more maturely) he has the staying power to wait for the right lady at the right time. Moon square Pluto can suggest some issues involving power dynamics with women; and Mars-square moon, sudden anger flashes, though basically his moon looks like it's in decent shape
If we compare your charts, you sun exactly conjuncts his moon. Your moon conjuncts his sun. These are powerful inter-aspects, so if nothing else you have the capacity to be excellent friends.
So far as romance and sexuality go, his Mars (the "boy" planet) conjuncts your Saturn-Pluto; so even without your meaning to, he may see you as inhibiting his masculine expression in some way. I don't think you can or should downplay this: rather see if there's an empowering interpretation out there if your relationship continues. Because of your sun-Pluto square your sun (identity) you may struggle with a lot of power dynamics in relationships unless you can use this energy to be a huge stand for personal development and self-transformation.
Because if you do get together and you've got some unresolved sun-Pluto-Saturn issues, and he's Mr. I. Gotta B. Me (sun-Uranus) it might be hard to work out an interpersonal style that supports both of you. But with your Sagittarius moon-Venus-Jupiter combo, you need some freedom in a relationship, as well. So this is doable.
Your Mars is just off conjuncting his Venus (the "girl") planet although they are in compatible signs. Ditto for your Venus and his Mars.
You can go through the rest of your interactions in this fashion, but I would just focus on the ones involving your inner planets and ascendants.
Just now transiting Neptune is squaring both your sets of Sagittarius planets, so this makes it especially difficult to determine what is real and what is only illusion.
Sometimes a composite chart will tell a different story-- sometimes not. You can do one at Astrodinest, so it's worth a look.