<human>: Give me a shortened version of the text

I met this girl the beginning of my sophomore year of college, and things have been going (from what I can only assume) ideally. We have a healthy relationship with good communication (in and out of the bedroom). She's a very pretty girl, and kind. This sounds bad, but I can tell from the way my single friends look at us that they are envious (they cheekily tell us from time to time as well). The point I'm trying to make is that this is from what I can tell a really good and lucky thing. 

Yet when she's not around I don't think about her at all. I have trouble responding to texts, I forget she sent them. I just get utterly cold towards her. Then, when I see her the next day, I melt. I remember completely why I'm so in love with this girl. It can become almost sickeningly euphoric. But then she leaves, and the switch flips again. She's gone from my thoughts. This process, as it repeats over and over again, is beginning to strain me a lot. I am so confused. 

This is going to sound very self-pitiful and overly introspective, but I'm beginning to think that the death of my father at such a young age (3) has damaged my ability to maintain a steady emotional grip on a relationship. I never expect anything from friends, and I readily feel abandoned by them even when the reasoning is unjust.  

This is something I've struggled with all my life, and I have a feeling that this new relationship and the emotional weight it carries are beginning to truly manifest something wrong with me. 

I guess what I'm here to ask is: has anyone else struggled with this? Is it some other issue that I'm missing? Any advice/info would be lovely.
<bot>: I only love my girlfriend when she's around, and I think I have trouble becoming emotionally attached due to the death of my father at a young age.