Going to come from the opposite side of the snooping fence here.....
I do think context is important. I see a lot of people saying "Don't worry, I sent flirty texts, it doesn't mean anything" but remember, your relationship is different and what is okay for your relationship is not okay for someone elses. It is also pretty obvious that saying you do send these flirty texts to friends, but if the lady ever saw them she might not be happy....is probably crossing your relationship bounderies too. Just because "It doesn't mean anything" to you, as in, you have no intention of sleeping with, or acting on the flirting, doesn't mean the flirting in itself is still not heartbreaking to some people. Just because it is a bit of fun for you, doesn't mean it is not hurtful to your partner and if you feel any need to delete those messages, or put a lock on your phone, or feel nervous or angry if your partner snoops...then you probably KNOW you are crossing the line and potentially hurting them, but saying "It doesn't mean anything" is denying him or her...their feelings. It clearly means something to the OP and if I ever found a text like that on my guys phone, it would hurt me too. If that makes any sense at all?
I often feel that using the "It's wrong to snoop" is almost like...the BEST excuse for anyone up to no good. Its perfect. You turn the guilt and the wrong doing back on to the person who caught you out in a lie or cheating or some version of it. It is simply a way to rise upon a pedestal of righteousness and say "You snooped, what is wrong with you" People now feel so guilty for snooping but the ironic thing is, people don't often snoop unless they have some suspicion of some kind. Maybe this is biased but...I found that almost every single partner I was with, who kept their phone from me, or kept it locked and who brought up the subject of "Snopping is wrong and shouldnt happen, I would never snoop on you" were the ones who I later discovered were up to no good! lol. It is kind of obvious that when a partner does not flinch when you pick up his/her phone and tells you their passwords etc, are generally like that because they have zero to hide. I never did understand the whole "Snooping is bad" thing because, in a serious relationship, snooping shouldnt exist anyway because, what secrets, unless your in the CIA, would you need to so protectively keep from your soul mate? Maybe I am missing something. I also understand it is impractical and impossible and totally over the top to walk in from work and relay every conversation you had, show them your phone, emails and what not, but if your partner casually picked up your phone one day, whats wrong with that? Unless you have something to hide? Seriously what is wrong with your long term partner casually reading a text? Why is this snooping? I am confused lol
I dunno. I think thats my jaded opinion on the snooping thing.
OP: If it were me, I would not be able to NOT talk to him about it and I would feel exactly the same as you, especially if my guy had paid me little attention but was splashing the compliments around on other women. I would take that as an insult yes. It would hurt me a lot.