You need to have a conversation about timelines at the very least. This is not sustainable. Does her additional commitment have an end date? Or is there a way to move to less extreme hours as she gains seniority at her job?
Having a timeline for when things will return to a more normal amount of time together will make it easier in the meantime. Also, if you can agree to a date night where you disconnect from your devices and do something together at a regular schedule may help you keep from feeling as much relationship strain.
I wouldn’t worry too much about it. It sounds like he is very shy and inexperienced. It’s probably just excitement/nerves. You can ask if he likes hugging or if he’d prefer something else. If he says he likes it, I wouldn’t bring it up anymore.