Is it normal if he brings out the opposite in me?

I noticed that the way my bf is with me is the way I was with my ex. One of the reasons that attracted me to my current bf is that we shared similar qualities. Individually, were laid back and super chill people with the same sense of humor and the same values. But once we dated, I believe its cause I became so into the idea of what we were and what we could be, I started acting like the opposite of myself which is weird cause being similar is one of the reasons why we got along so well. But the way we are as individuals is not ur typical bf or Gf. My ex would describe me as not ur typical Gf. I wouldn't really display our relationship on the internet and post cute things about us. I also wouldn't get jealous of him and other girls. He'd wonder why and I wouldn't care much if a girl tried to flirt w him or vice versa. Jealousy is just not in me and if I get a little possessive, I don't show it much. So those things are exactly what my current bf has; he doesn't act like us typical bf (which I love and hate all at the same time) and he doesn't get jealous or show it. BUT, now that I'm with him, why do I seem to carry the qualities my ex carried? Kind of attached and gf-like? When I talk to him he reminds me so much of myself, its like I'm talking to myself. So when I get mad at him for some things he does or doesn't do, I remind myself that that's how I am too but for some reason im not like that with him ? Cause i care more this time? I dunno.