My initial guess would be IEE, ENFp.
Your first-post here included the Reinin Dichotomies. While interesting, I don't really type that way. Intuitives love that stuff and eat it up for breakfast. You tried to type yourself by making connections with the dichotomies, as opposed to simply listing what you do, what you don't like to do, how you spend your time, etc. There wasn't really anything specific in your first post that makes me think you're a sensor.
Also, your writing style 'flows'. It doesn't seem concrete. You seem laid-back and relatable, with the 'everything is relative' mindset more.
You also don't seem concrete sequential, when it comes to grammatical rules. Throughout this entire thread, you've not capitalized the pronoun "I", but instead type a lowercase "i". While a bit anal, that bothers me a bit, and I know other LSEs like Director Abbie strive constantly to be grammatically correct.
You seem like you utilize Fi pretty easily in expressing how you feel. Not dramatic Fe, but in that you're able to clearly and confidently how you state about the picture that lungs posted, your feelings toward the relationship with your ex-girlfriend, etc. You also seem like you're diplomatic and able to maintain relationship distance well.
Lastly, your style of considering different functions & typings for yourself reminds me of fen, another IEE on the forum. The style itself seems very Ne to me, in taking a very open-ended approach to understanding each function, each possibility, how it could possibly fit and relate, and wanting to seek other people's opinions as considerations without firmly or confidently stating that anybody is wrong.
The tests you took seemed to indicate ST, but I really don't think those tests are great at all. Depending on your self-perception, you may test completely differently each time. I've taken multiple tests and can type differently how I feel. Besides, it's easy to understand what each question is asking for, and to get a certain result if you try.
I think the standing up for your ex-girlfriend could possibly be perceived as sensing, and it's not something typically IEEs would seem to do. However, that may be a special circumstance. I think guy IEEs come across differently than women IEEs. Also, ethical types can be very strong when they believe they are right, considering outspoken EIEs. And a confident IEE could easily stand up for themselves in that manner.
IEE would be my initial guess. Doesn't look like anybody else suggested it yet. Consider it a starting point. Again, the more you post, the more your natural style will come out. So no worries on trying to figure it out right now.