Should i talk to someone about it or not? should i care that my mom will be mad? what do you think i should do?

ok were do i start. i came here before for the same question, but i have another one. see my mom and dad are married but having issues. but for some reason my mom goes on the computer to meet people and stuff. she said to me i will never go and meet up with these people. but what does she do.... go out and meet people. i was very mad, and still get very mad and sometimes emotional about it. because onetime, she was going out to meet someone in clearwater and i noticed dhe was borrowing my bag. so i was like watever, then a couple days later i went and looked through the same bag, and found condoms. know u must think, well they could be my dads. but my dad had a vasectomy. so if u put 2 and 2 together, u can figure it out. but know its going to far. i overheard my mom and dad talking on christmas eve, my mom is planning to go and meet this person in atlanta georgia in febuary. i will not let that happen. i love my mom to much. now heres my question.... should i tell my aunt about it or not? the only reason i would tell my aunt is, she would not let my mom go. so if u could, please help me. if u have any suggestions on what to do, please tell me. all answers will be appreciated.