Any tendencies within you toward emotional displays or instability are only heightened by this relationship. What you both need is a grounding influence, a certain level of support, nurturing and sensitivity -- and unfortunately, you're not likely to get that from each other, unless other aspects between you support a more stabilizing influence. You find that you relate to each other erratically -- one minute you think yourself in love as you experience intense feelings of togetherness, but then something your partner says will hit a sensitive button deep inside you, one of insecurity or hidden anger, and then the proverbial you-know-what hits the fan!
Granted, this can be pretty exciting; those lows you inspire in each other only serve to make the highs feel that much more intense and heady. The problem is, you won't know how to stop hitting each other's buttons. Something between you just inspires this kind of touchiness that won't do much for any overall feeling of trust or intimacy. In order to make it work, you have to allow for plenty of space within the relationship, if for no other reason than to provide some cool-off time for those moments when you set each other off. But space can lead to feelings of loneliness, and in the end, you might end up deciding that a close romantic relationship just isn't possible between you, and a friendship will better suit the two of you.