Yep. Dude is needy and clingy. Relationships where one partner is needy and clingy never work and the needy, clingy person is always left wondering why.
Sheesh, but you're hard on the dude. If you read the quote carefully it actually sounds like she was the clingy one! Yep, his letter is soppy and smacks of someone who wrote it while being quite high on tears, self-pity and misery, but give him a break. It sounds like the breakup came from his side as he didn't want to go to CT, and he's apologizing for hurting her, while pitying them both. Not quite suicide watch material.