Is this a bad sign?

My boyfriend is amazing and he treats me better than any guy I've ever been with but my feelings feel.. non existant sometimes. With my ex boyfriend, I use to get crazy jealous, particularly about his past relationship (he had a child with his ex gf and was engaged to her for a while). With my current boyfriend, I don't feel jealous about his past (he had been married for a few years before). I should be feeling some type of way about it. But I don't. That's very unlike me. Is this a bad sign? Or does it mean I'm finally in a healthy trusting relationship?