Is she cheating or am I paranoid?

ok. Ive been dating this girl for about 6 months and things were really good. Long story short, early in the relationship she went thru my cell phone and busted me sexting. I promised I would stop and did. I deleted the females contact info from my phone and havnt tried to reconnect. Days later I went thru her email and found she had a life she had been hiding from me. I know things she has done and although she knows I went thru her email I would not tell her the things I know because it would hurt her. Its fair to say I have trust issues now. She will leave work at say 3pm and by 6 pm I havnt heard from her. I send a text and she gets pissed off telling me she has been at the store. For 3 hours? really? I know there is a ex BF she is texting. She doesnt know I know but the day afetr the texts, she is gone for hours and hours. She comes home, says she has to pee and is in the bathroom for 10 15 minutes. She comes out and I have a feeling. I go into the bathroom and sure enough, there are her panties she wore haning in the shower all wet from being rinsed. I ask her after being slick and rubbing her lower back..I say Hey no panties today? She says no I took them off and rinsed them because Im all sweaty.. Im only giving you 1 reason I suspect something but believe me there are a bunch. Am I falling into the trap my distrust has set or is there something going on here?