Is there a thing as to much trust tho?😐

I'm not complaining! but my husband he trust me so much we had our ups and downs where I just got a lil more comfortable chatting to guys and ended up kinda flirty but it stopped 2 years ago, since then he does not go through my phone, does not care really who I speak to, a guy can literally come up to me flirt and he would just act like he didn't see it, I tried to trick him so many times to see what he would do say I cheated but he laughs it off, at night I would "pretend" to laugh at my phone like its another guy and he would just laugh and sleep like a baby its unbelievable actually! is this normal it's like he dosnt care 🙄 I'm starting to think his being shady that's why his so chilled about everything 🤔