Why do I do this and how do I stop?

I don't know if this is the right place to put this, or even ask this but I am desperate. This is my first post, I joined to find answers to my problem, so if you need more info, please ask. I don't know how to really explain this without it becoming a hugely long post.

I have an online friend (my only friend) whom I have only known for a month or so. We have talked every day for between 7-12 hours via video chat. There has not been one day we missed talking for at least that long. I feel very comfortable with him, I can honestly say I love him as a friend and we can talk about anything with each other. This person is very important to me but I have noticed some disturbing behaviours/thoughts/feelings on my part. Such stupid little things.
I tend to react emotionally at some things, way more than I should and often at things that shouldn't warrant and emotional response.

Sometimes he will say something and I can feel my mood change and my emotions start to shut down. Or I will get angry and want to leave the conversation. It can be any little insignificant thing. For example, this morning he was asking me about the place I work part time and I gave him a yes answer without elaborating and he rolled his eyes. I could immediately feel my mood shift and I wanted to run and hide. Usually I would have found a way to end the conversation quickly but I didn't this time, I stayed and talked with him but I felt distant the whole time. I did eventually end the conversation because I was feeling more and more uncomfortable.

I do this with everyone apparently but have only noticed it recently with this person. I don't want to lose this friend, so I want to find out why I do this and how I can change it.

STOP. Because you know you need to stop. You are wise. This is an internet hook up. No one needs to know where you work, life or any such thing. The fact that you are questioning this person is evidence that you know it is going down the wrong path. NO ONE talks video chat daily. No one talks that long either. Husband and wives don"t. Grandma's and grandkids don't. They have lives. Gardens to weed. Walks to take. Painting to paint and dogs to feeeeeeeeed. Do you work? Do you read? What else could you be doing?
You know what to do. Take care of yourself. Watch out.

Hello and welcome to Psych Central! I agree that this relationship seems to be getting out of hand. I can't imagine spending that much time talking to anybody, including my husband, friends, children, etc.

I encourage you to talk to a therapist about the questions you are asking. I have found therapy very helpful in understanding why I do things and in getting me to stop them.

If you don't mind my curiosity, I would like to know what one can talk about with one person for 12 hours a day, even if it was just one occasion.

I have a gf, my age, whom I have known since we each were 4. She now lives in Midwest. We talk on the phone a lot, but we are yet to beat your record of 12 hours a day. Tell me, please, what you talked about with him, because if you don't, my gf and I might simply die out, like dinosaurs, never having reached your heights in conversing.

On a more serious note, you need to diversify your portfolio of contacts, your portfolio of activities, etc. You have placed all the eggs in one basket, and that has started to backfire.

Thank you all for your replies