@AlexCer: For all intents and purposes it probably IS Rick. If Sam's smart he knows the best way to get in the good side with Lauren again is to drop hostility with Rick, and settle their differences amicably. She'll probably hear from Rick about what he did, and that'll begin the process of healing which might lead into them talking again and eventually getting back together.
@Skylan2021: Neat plot hole you discovered. None of Sam's other friends would even give Rick the time of day, so there's no way they got his phone number, and it would be incredibly hard to look him up in any directory given that all Sam knows is that his name is Rick "That guy with the goofy goatee and the smooth ways with my lady" McSomethingorother.
"The way I've been behaving the last couple weeks" implies that he was behaving better toward this person before this. I don't think it's Rick. I'd bet on Lauren or Christo, and the hair looks just like Lauren's.
However, I do hope it's Rick. I too feel like he should apologize to Rick before talking to Lauren again. As for getting in touch with him, yeah, should'nt be too hard to find him. Also, Rick hangs out at Cafe Max all the time now.
Panel 2 suggests a male physique. Also, why would he meet Lauren in a coffee shop to talk when they live together and could do so at home? I know Christo lives there as well, but it'd be simple to ask him to take a walk. Furthermore, the mystery person asks what there is to talk about. Lauren would damn sure know what there is to talk about.
As such, I vote Rick, but I'm bracing myself for a surprise.
If it's Rick it might be good to try and talk it out and make the surprise that they would be willing to meet a bit more understandable.
If it's Lauren then that same surprise makes me think he opened the door that night.
Course it might be an Ex we haven't met before.
'Tis Mr Rick!
It has to be Rick, because he's being much more calm about this than Lauren (given how she's been behaving) would be.
It'll be nice to see them make up, and interesting to learn what Christo thinks (if he finds out) about this particular apology.
I think it could be Rick because he's being a wee bit formal, more than he would be if it was Lauren, but who knows. It could be lauren, and they could be meeting there because it's in public, and there's less of a chance of them breaking out into an argument. It's one or the other, we'll just have to wait and see.