This is a fair response. Truly, looking into charts can feel like looking into a kaleidoscope - something I’ve come to love about astrology thus far!
A part of me wonders if my Venus in Cancer is attracted to this person because of the unconditional love and/or support they didn’t receive growing up. It’s like I sense this on a primal level and I’m hesitant to walk away because I feel they’ll find themselves in another abusive relationship, and somehow want to protect them from this. (Me thinking out loud)
You've got lots of nice chemistry aspects with this person. To pick out a few: Moons sextile, Suns sextile, Venuses trine, your rising sign is their descending sign and vice versa. All that easily adds up to attraction.
They have a very Scorpionic chart, and you have Scorpio rising. So Scorpio's need for privacy and tendency to test others surreptitiously before deciding to trust them (if you ever do) applies to both of you.
For someone with Scorpio descending and a heavily Scorpionic chart to boot, relationships will naturally be Scorpionic, and those Scorpionic relationships are what they need for their own personal growth. Those are relationships that bring out the shadow in both parties. You two have hit that already: the lack of trust.
Abusive relationships are the worst kind of shadow relationships. Healthy relationships are also possible, if both people are acknowledging the shadow and working it consciously.
But you need to make your decision about this relationship based on what's best for you. If you only make your decision based on what you think your partner needs, you'll leave your own needs out of it, and that won't make for a good relationship. Not only that, you could be wrong about what you think your partner needs.
Would synastry offer me a look at how well we interact, and then the composite offer me how others view our relationship? I’ve read that the Davison chart is the place to look when assessing how our energies mix too.
Synastry shows the relationship dynamics. An in depth reading of a synastry chart would bring out how each of you experiences the relationship, and if done well, would have you saying, "Yes, yes, that's exactly what I/they do!"
Composite is the chart for the relationship as an entity in its own right. How does it manifest in the world, independently of either of you as individuals? Transits and progressions to the composite chart reflect external forces that affect the relationship and the way it evolves over time, respectively.
But a composite chart really only exists if the relationship exists, and it's only as strong as the existence of the relationship is. If this were just a crush, the composite would be meaningless, because there would be no real relationship at this point. For a relationship in the early stage, it has some meaning, but it would be an even more solid entity if you'd been together longer.