I'm not sure on how to respond, because I'm not too sure what it is you seek...

What is depressing you exactly?

The fact that she was drunk when she first had sex, or that she didn't enjoy it?

As for spending all your free time with her, well obviously that is not going so well for you, you are acting irresponsibly by putting your job at risk and you are drifting away from your brother, neither of which you are happy about, so change it.

There's no law that says you must see her every weekend, you have a life outside of the relationship, and there's no rule that says you must stay over when she asks, especially not if you can't be disciplined enough to get to work on time.

You're an adult, and you have the ability to make your own choices, being responsible means making choices that might not always be fun, but the end result is they benefit you.

If you could elaborate on what is depressing you, I'm sure you will find a helpful response from a member or 2.

I'm sorry you seem to find yourself in this depressing predicament, and I hope you find the courage and the way out of it before it has any longterm impact on your life.