The air of intensity when you're together can push you each to express yourselves in a deep and intense way, but after a while of this, you likely noticed that one of you isn't as adept at accessing your inner feelings and truths as the other. The problem could be that you just don't go as deep and dark as your partner, but it's more likely that they're the one who has trouble bringing their darkness to light. You'll find that you have an easier time putting your impressions and emotions into words than they do.
And you might even discover that all this time, when you've been forcing each other and yourselves to face down your issues and ferret out your deepest, most buried emotions, your partner has been using you as an emotional projection screen. As a result, you might begin to feel like little more than a mouthpiece for their emotions, the ones they're unwilling to express because the feelings are too weird or intense or otherwise unacceptable. If this happens between you, the effect could push you even further into the negative possibilities of this aspect's influence: You could start obsessing over their problems, appointing yourself the custodian of whatever has gone wrong in your lover's past to create the emotional problems that exist today. You could experience bad dreams or even start feeling depressed. Be careful that this influence doesn't wear you out.