She's drinking away her sorrows at the bar while some random guy comes to 'comfort' her but the singer doesn't want to lose her. To me it sounds like the guy hurts girl (i don't know if physical or emotional.) he's apologized over and over but he knows he was wrong (hence holes in his apology). Clearly he’s not going to because a little bit earlier in the song He pointed out that he found someone to carry Him home. He agrees to do so at the end of the song but that’s probably just to pacify her so that she can engage in the behaviors with him. After all it’s Janelle in the song that is repeating, “Carry me home tonight”. And, in turn, she asks him to carry her home because knows she's gonna get trashed. Now clearly she buys into this plan of drinking. And he’s even put out there that he’s found someone to carry him home. But now he’s using his friends returning as an excuse to drink more than that. I interpret this part of the song as, he and his girl were obviously at the bar which means they probably planned on having one or maybe two drinks, therefore keeping the night good clean fun. Or a person may have an open tab (no limit given) which allows the bartender to charge as many drinks as they want to drink. The bartender knows not to exceed that amount.
So a person may go out with a group and give the bartender his credit card and say, “My tab is $50”. But a tab is when you give a credit card to a bartender and allow them to charge a certain limit on drinks. Now I know there maybe some young’uns reading this and may not be familiar with a tab. I’ve also heard, “So let’s raise the toast”. “Because I found someone to carry me home tonight”. But ah, now the excuses come, “But our friends are back, so let’s raise the tab”……. Then he says, “I just thought we could find new ways to fall apart” He’s saying I was willing to try something different”. What he’s saying is that I know that dealing with me you got more than you bargained for. In the next verse he says, “Well I know that I’m not all that you got”. He wants her to engage in this behavior with him. He’s like, “Look babe, we’re young let’s just have a good time to night. Like a typical addict he’s making excuses for why he’s going to engage in his irresponsible behaviors gain. Then the chorus comes, Tonight we are young. When someone has “holes” in their apologies it means that even though they’re apologizing, they’re really not taking responsibility for their actions What he’s saying is, “Look, I’m sorry, I know I drink sometimes, and stuff, and my apologies don’t really make any sense, believe me I really am trying to take it back”. He sings, “But between the drinks, and subtle things, and the holes in my apologies, I’m trying hard to take it back”. So now he approaches her in a gentle way, but his mentality clearly hasn't changed. Now he's probably thinking "darn, I just got high, which is bad enough, but now this guy is bringing up that freakin scar". The song continues, "You know I gave it to you months ago. The guy saw the scar and probably asked her about it. Now the "sunglasses asking about a scar" is probably a random guy who just happened to sit in his seat when he got up. That incident may have left a permanent mark on her while others didn't. Just because he mentioned that the gave her the scar months ago doesn't necessarily mean that was the only or last time he was abusive towards her. They use drugs, they become aggressive, and then apologize. I interpret it that he has hurt his girlfriend either physically or emotionally while he was under the influence and he had told her he wouldn't do it again and like most abusers and addicts their behaviors are often repetitive. He’s probably promised her that he's not going to engage in those behaviors any more. Now he has to explain this to his girlfriend that they're all in there getting high he probably snorted a little bit of coke or smoked a little bit of weed while he was in there). Now where do we imagine he was coming from? He was more than likely coming from the bathroom where his friends were "getting higher than the empire state". This means it was his seat and that he was supposed to be sitting there, and somoene took his seat in his absence. Then he further states, "MY" seat's been "taken" by some sunglasses asking about a scar. He says "my lover" is "waiting" for me just across the bar". He doesn't say "my ex happened to be across the bar" or "this girl I used to date is across the bar". In the song he says, "My lover is "waiting" for me just across the bar". He clearly has issues with substance abuse, and she most likely does too (maybe just not as bad as him). This song is talking about a young, immature, and reckless young man who is obviously in an unhealthy relationship with a girl.