over reacting? Help!! can't sleep:/

So a few month ago I was going through my s/o emails and came across a large about or porn stuff and a girl sending him photos. Which he labeled her emails as spam I guess in hopes I won't notice. I also found from past emails he was still being sexual in the start of our relationship,with another girl he claimed to have broken up with.It was a huge deal because he went on ,when we first started dating ,about how he hates cheaters and everything else. Also because he never wants sex anymore. We have addressed it and even though Iam still upset with it all we have moved on because it happened so "long ago" I have gotten past it a bit but,will occasionally go through his phone (I know I shouldn't) last month I noticed a txt from a girl named Andrea he reassured me it was just a girl in his class for note exchange. I didn't worry to much they hardly txted. Although tonight I noticed he has her on spam... Which doesn't make sense to me he never mentioned anything happening to cause him to do that .... I am just not sure if I am over reacting or not ... Should I even mention it to him ???? For now she's off spam for txt so if she ever does txt I'll have some kind of idea of their relationship. Advice please and thank you