...loneliness?

And the difference between alone and lonely?
I have believed for a long time that we're all alone. Whether on a deserted island, in your house with your family or in the middle of Manhattan's rushhour: Nobody can look into our heads, nobody can look into our hearts, we all have our own individual struggles that many people may share, but whoever says "I know how you feel" is lying, because they simply don't. Can't. In my book, we're all individuals and responsible for our actions. That's alone. Not unhappy or miserable or sad or suicidal or extatic or happy any other value attached to it, simply on your own, in your own company.
Loneliness on the other hand has negative values attached to it, at least in my understanding. You think nobody understands you, the world's gone crazy, because essentially your own company isn't satisfying your needs anymore, emotional and otherwise. I have also believed for a long time that once in a sentimental relationship, both feelings of alone and/or lonely would subside because there would be someone there to share my struggles with. Problem shared is a problem halved, joy shared is joy doubled and all that. After many months of relationship with this sensitive yet totally unemotional guy I've realised that my idea of a perfect relationship did involve using the partner as an emotional crutch. I admit it, and I'm now trying to move past it and grow. I shouldn't need him to be happy, I shouldn't let his moodswings influence how I feel. We're two individuals who happen to live together. In the past year I've actually done a lot of growing and soul-searching, come to think of it, but that's a good thing because I'm learning about myself and that helps me feel less alone. He's a good teacher in that respect, as detached as he is, because I'm left to draw my own conclusions.
Since we've moved over here, my emotional needs have been off the chart. I've been feeling sad and lonely for many weeks, communicating clearly that I need more of my partner's attention. He's giving me what he can when he can, but it's not nearly enough so I've given up asking. He truly believes everyone is responsible for their own feelings 100 % and that in turn he is in no way responsible for anyone, not even/especially not me. So what is this teaching me? I am learning that I mustn't depend on him to help me through this bad time. I have to take care of myself, put myself first. I never thought I could feel so lonely in a relationship. And the time of year doesn't help.