I've been seeing this girl for two months now, and things are going well. When were together we talk and laugh the whole time. When were apart she will message once to twice a day. She also has a very low social battery, needing to recharge for a day or so, which leads to after our date or hangout I'll drop her home and she zooms off and gets absorbed into whatever she needs to have done

She has an incredibly demanding research job and is studying her PHD and texting isn't her first priority for things. This leaves me to feel a bit lonely whenever I drop her home and I'm not sure why. The past two times I've had a large sense of loneliness. I know she has feelings for me, she does alot of small things like handmake me gifts or talk to her family about me.

I'm her first boyfriend, so this is all new for her. How can I communicate to her that I'm feeling this loneliness and that id like to spend more time with her? I've dropped subtle hints but I need tips on how to communicate it more effectively, all the while she only replies once or twice a day