I lied to my boyfriend before and got caught. Now I'm stranded outside and he doesn't believe me.
Are you lying this time? Are you actually stranded?
I went out to party with some friends and on my way back it stalled so I'm stuck on the side of the road.
I'm sorry you're stuck out there but I think this is a good lesson for you. You shouldn't lie to your boyfriend in the first place because you'll make the person not trust you anymore. Now you're stuck out there because he thinks you might be lying again.
*sigh* I'm fine here. He doesn't have to leave his sleep to come here. I'm stranded so I'm not going anywhere.
That's good, stay where you are so someone can find you easier. You can take this time to reflect on your mistakes, as lying is unhelpful and put you into this situation. How about apologizing to your boyfriend when you meet back up with him?