<human>: Can you condense the text into three sentences or less?

I'm 22/male and recently finished college, and have been in a relationship with my SO for 2 years. 
We met in college and we got on great, I love the girl. But since finishing college we've moved back in with our parents and live about 250 miles apart. It's a case of taking it in turns to go and see each other every month, but it's getting more difficult. 

Recently she seems to be quite disinterested and takes my sarcasm as offence and we argue about small things, the conversation isn't as fluid as it once was. We used to pride ourselves that we didn't fall into the petty traps that other couples fell into. 

I want to get our relationship back on track and back to how it was; whenever I hint around the topic and ask if we're doing okay she says she's fine. 

Any advice? The obvious would be to get jobs in the same city but it's still quite difficult at the moment with a lot of application forms going out. If I haven't got a job by September I have an interview to volunteer in Africa and I'm wondering what kind of a strain that too would put on the relationship.
<bot>: relationship has changed since going long distance, want to get it back to how it was/approach the conversation.