uhm I dont see anything wrong in the guy not seeing her off, neither do I see a big deal with the goodbye hug and kiss, cos those things are not programmed, they come with mood, and if the guy is not in a good mood for it, then he likely won't do it.

Based on the story you shared, it is not the first time they spend time together, and as a guy, the more time we spend with our partner[ or even the fwb or situationship kind] the less we see the need to do things like seeing them off when they visit and also she told you the guy is having stressful time with his work so his mood was probably off and such a person won't be motivated for such a thing like seeing her off...

If their relationship was defined, she would probably tell him how that pissed her off, and he would apologize, but that does not mean he won't do it again.