I had this with a girl I met off tinder, we exchanged a hell of a lot of stuff before I met up with her and got intimate with her for real (no sex but everything else, so you know where I'm coming from (pun not intended)). Here's what I remember from researching it all:
- yes, it will spark up the imprinted pathways in your brain that your brain associates with porn
- it was, however, only of one girl, which is much less devastating to your brain than multiple girls in a short time frame. Your brain is built to take the stimulation of one girl - it starts getting its "reward circuitry" messed up when you overload it (literally) with multiple women.
So if I have it right, then the main danger here is looking at 1 girl which isn't too detrimental, but then that reminds your brain that it likes looking at lots of women and you'll get urges/messages to do that from your brain. That's the real danger of this scenario, and if you didn't do it then you've done well. I wouldn't be so hard on yourself.
P.s. When I met up with that girl from tinder, seeing the pics of her had prepped my mind to get aroused by her in the flesh, if that makes sense - and we all know a good remedy is "reprogramming yourself to the real deal", so I think it actually helped in that respect a bit. But of course, this is me trying to put a theory together - I know just as much as you do about all this!