I need to be honest with my mom

So basically some months back i thought me and this guy were vibing in a romantic way. had me thinking we were gonna get into a relationship eventually and that he actually liked me but he really only dragged it . i feel like someone should say hey i don’t like you like that from the beginning. anyways . ofc we did stuff when we were alone after just about anytime we hung out with friends. but one day i took him home and my mom was like take my car and i was like uhh i guess . so i took her car but then when i was about to drop him off he was like oh let’s stop here . i was honestly only going to drop him off . (i’m a virgin by the way) i do things but not really that much . & so much i’ve never done. but to speed this up. we basically did some things in my moms car and i feel guilty . bc 1 thats not my property & 2 it seems very disrespectful in my opinion. me and my mom are really close and i feel way better when i get things off my chest. Me and the guy have been ended whatever we had going on. Should I tell her? If so how when’s the right time and way to say it.

thanks :(