Okay cool. Again, you’re the only one who knows your own feelings and I’m only saying this going off of what you said. I could be totally wrong.
From what you’re telling me it sounds like you’re AroAce. As in Aromantic Asexual.
Being repulsed at the idea is sex is a common sign of asexuality, however some people can feel sexual attraction and just not like to have sex. So if a woman arouses you, then you’re not ace.
Your explanation definitely sounds like aromanticism to me, as your uncomfortable with the idea of sappy and/or sentimental romantic pleasure. However, the only thing that makes people aro is the fact that they don’t feel long term romantic attraction, or they don’t feel the need to be in a romantically committed relationship. Aros can still feel infatuation, like I do, but that’s different.
From what you said about your girlfriend, it kinda sounds like you’re interested in a queerplatonic relationship, which is a relationship some aros form with people they form close bonds with (typically a close friend). Since aros don’t feel the need to have a romantic relationship in the longrun, some aros form queerplatonic relationships so they can still have a life partner.
If this is the kind of relationship you want, or feel you are interested in, then I believe you only want this kind of relationship with women. My guess is that you find women aesthetically pleasing, and you feel infatuation towards women you find attractive. You just don’t feel the need to form a close romantic bond. The “I love you”’s could possibly just be friendly to you. For example, I tell my friends I love them all the time, because I do. I’m sure you do love your girlfriend, but maybe not in a traditional way.
I hope this helps in a way. Again, I could be totally wrong because I don’t know you or how you feel. But I hope some of this seems or sounds familiar in some way 