I feel guilty lying

I don’t have class on Thursdays and currently my boyfriend is home alone (I’m 20 and in college and so is he). I commute so I don’t dorm and it’s the same situation with my bf and we never get alone time unless our parents go out of town. Currently he’s alone in the house since his mom is out of town so I told my parents that I’m going to stay at school and study (which I am but I’m going over his house for like 3 hours and heading back to school to study). Idk I guess I feel guilty lying to my parents and I don’t like doing it but they are so strict and idk I feel like they’ll catch me but I’m in college and I want some freedom. Also me staying late at the library isn’t new I frequently do it.