Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: TLDR at the end
Bit of info, my friend and I have known each other for 15+ years, he has been dating this girl for 1 year, we are all in our early 20's

My friend texted me asking to call him saying my car broke down so he could leave a double date with his girlfriend because he was bored, I told him to be up front and tell her he wanted to go but he didnt want to make it awkward, I told him he was being an ass but I would help, so I called and said I my car was overheating and I needed coolant to avoid towing it. 

He leaves and calls me a few minutes later to thank me and tell me what happened. He said they were just meant to hang out at his girlfriend's house with the other couple (gf2 and bf2), the other couple showed up 3 hours late, gf2 wanted to watch a movie they've all seen and make out which my friend said was weird to do that it front of another couple, he said even the other guy was so bored he tried to make up an excuse to leave but gf2 called him out on it.

So fast forward a bit my friends girlfriend texts me to ask if I was okay, it's normal for her to text me as we are friends too. So I screenshot my conversation with my friend to send to her but before I do, I call him to tell him I was going to let her know what happened and said that he needs to be up front with her about stuff like this, he said don't tell her what happened and that he would talk to her later that night, so instead I told her that my car was overheating but I was fine. 

After my friend calls her to tell her what happened, she texts me back asking if I lied, I let her know right away what had happened, she called me out for lying and she said she felt like shit because her boyfriend (my friend) left her to be the third wheel with the other couple which even she agreed was getting awkward before he left. We texted back and forth for a bit and she seemed okay with what happened after I finished talking to her.

Am I being the asshole for going along with it and helping him, or is my friend the asshole for getting me involved and not handling the situation the right way.

TLDR
I lied about my car breaking down and to my friends girlfriend to get him out of a bad double date, afterwards I made him tell her what happened and she got upset for us lying to her.
Am I the asshole or is my friend for getting me involved?

lying to my bestfriends girlfriend