I’m being very specific for a reason. I think I have a clue what family bond love is, but I don’t think I had experienced any type of romance in my 34 years of life.
I’m aware this answer will vary, but that’s why I’m expecting diverse answers and then I could make a sum of all of them.
I have a really hard time understanding my feelings. With a couple of romantic partners, I feel myself becoming happier when I’m with them. When they walk into the room, I get a little burst of oxytocin.
I don’t think I understood what it was in all instances.
Weirdly, I didn’t always feel at ease with them.
Like others have said: it varies from person to person. I haven’t felt the prosaic emotions other commenters described.
And, of course, it changes with time.