Not sure how to feel

Unfortunately I found out my boyfriend of two years was cheating on me. I immediately got tested a week later and found out I have syphilis and I also contracted HIV. I’m on a road trip with my family taking my sister to college and when I got the call, I basically had to hide and go cry so I wouldn’t ruin the trip for them. It’s been two days and I have to keep this face on like everything is okay. I’m also hesitant to tell my mother because I tell her everything but I’m not sure how she’d feel and now I don’t know how to deal with this.