I know there have been a few of these topics recently however my situation is slightly different.
I was dating a girl for 2 years, for the first year the sex was great between us and I didn't have any desires to see her with anybody else or to bring anything 'different' to the bedroom. The tail end of the last year of the relationship, I started watching and reading cuckold porn. I did bring this up with my girlfriend during sex about how "I had a dream she got fucked by somebody else and I found it really hot."
I continued to bring it up with her during sex and would ask to talk me through sexual experiences with previous boyfriends however she didn't really respond to it and if she ever did, it was very obvious that she was saying things just for my pleasure. I did bring it up seriously with her shortly after but she shot it down and got quite offended so I dropped it completely however still got off to the idea of her with somebody else and continued to enjoy cuckold porn. The relationship ended.
I have since entered a long distance relationship with a new girl. I'm in love with her. The thought of her being with somebody else would break my heart. She has mentioned previous boyfriends or a random story about her day that involved for example "so this really hot guy came up to me and my friend..." and i've gotten jealous. Now the thought of my ex saying something like that or talking about sex with an ex would turn me on, why doesn't it turn me on with my current partner? Do you think it shows that maybe I didn't REALLY love my ex?
One difference between the two which I think could be key is that I'm more insecure in this relationship due to the fact that its a LDR and its still very early. With my ex, regardless of who she slept with, I knew she would still want me afterwards.
Maybe I just answered my own question but your thoughts would still be very much appreciated