<human>: Can you provide a brief overview of the text?

Let me just say that this is the first real relationship I've had, and it's been even better than I could've imagined. It's been amazing and although we occasionally have arguments, we always sort it out well and I'm always very happy when I'm with him. 

The problem is, when I'm not with him I basically get depressed. I find it hard to find motivation to do work that I really have to do, I don't feel as much joy doing hobbies I normally love, I get irritable with my family, and basically I just withdraw into myself and end up feeling very sad. 

I do miss him a lot when we're not together, but what bothers me is more just feeling depressed in general. It's not that I don't have much of a life - I'm actually busy a lot and do a lot of university work and activities, but I still feel kind of depressed even when I'm not really thinking about him and busy doing something else. 

My other main problem is that I also feel depressed when we don't talk much, and - to be honest - he sucks at texting back quickly. I know this is a very guy thing to do and I shouldn't be annoyed, but it still makes me feel really sad when I know for a fact that he isn't doing anything and still takes 2+ hours to respond to a short message. I don't want to tell him that I want him to text more because I know he has his own life and I don't want to come off as clingy, but I really don't know what to do because it makes me feel shitty and insecure all the time.
<bot>: I feel really depressed when my boyfriend isn't around, especially when he doesn't text back quickly. What can I do to stop feeling like this?