Daughter upset over my new boyfriend

I divorced my daughter’s father 3 years ago when she was 14. She is now 17 and a senior in high school. I started dating again last year and have now been with my boyfriend for 7 months. Every Saturday, my boyfriend and I go out out for dinner (just the two of us). My daughter told me earlier today that she’s tired of my boyfriend and that she feels i care more about him than i care about her. She says that ever since I started dating him she feels like she’s less loved. She also told me that she doesn’t like that we go out every Saturday without her. She told me all of this in a very mature, calm way. And I kind of feel bad now. She was so used to having all my attention 24/7 and now she has to share it. She doesn’t have many friends, she’s very quiet and to herself. So it’s not like she can just go out with her friends and have fun while my boyfriend and I are on our dates. She just stays at home working on homework and she says she feels awfully lonely and would prefer if all 3 of us go out on Saturdays together. But i also want alone time with my boyfriend, what do I do?