Like you already said there are multiple reasons that go into explaining the reason you were feeling the way you were this morning/yesterday night. More likely than not it is some sort of combination of all of them.

some preliminary reflections:

Because we are essentially alone in the world (no one else knows our day-to-day activities, no one else is in our heads, knows how we see the world etc.) the only way to obtain lasting and authentic happiness/satisfaction is to maintain internal peace and stimulation. This is/will be true forever.
John Doe is an externality that has affected you and thrown off your internal balance. This is not a bad thing. He challenges you. The relationship with him is showing you where you are weak.

As evidenced by your feelings, dependence on another is NOT a pleasant feeling in this context. It's not that you haven't previously been dependent on someone else it's just that it hasn't been an uneasy feeling in the past because you have always been the one who is ultimately in control. He's not reciprocating the way you are used to.

Moving forward I would urge you to keep in mind that, no matter how strong they are, emotions are fleeting. When we surrender to them we inevitably become dependent on them or the person who induces them (and therefore dependent on externalites, things not in your control). To be so entangled with someone else is a very dangerous thing. Nothing comes without a price. What we give up by leaning on someone else is not evident at first glance. It's not usually the case that the person's presence in one's life is the problem, but the leaning that is the problem. Also consider the fact that, more often than not, a person's attractiveness and/or power over you is dependent on the power struggle; you have always won the struggle easily, not so here.

Keeping all of that in mind I would try not to over-think things, try to clear your head and live moment by moment concentrating on centering your mind and the depths of your soul. Enjoy these last few days where you are.