Mafia 11. X-men

They were beating around the bush and, after all that, they ended up suspecting me. I'll say something about the heart (because the contrast about calmness is clearly incorrect, as Siverfale already pointed out). The inscription on my userbar implies that something or someone is **in** my heart, and judging by the murder, specifically how it was committed (the heart was ripped out), I mean: if it said, for example, that my heart was stolen by someone, or with someone, somewhere, or if the murder was committed by stabbing the heart (or something else), then there would be a reason to suspect me, but as it is, there isn't. So, I don't even know what to call this clue, maybe indirect.
And as for who is Mafia and who is Town, I don't understand at all, it's all so confusing, especially since it's my first time playing, so I'm an uninformed player.