Is it wrong to be too complacent?

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I am 101% sure that my husband will never cheat on me. I know he adores me and loves me so much. I have friends who are very insecure, some of them had experiences of being cheated by their partners. They told me that i shouldn't trust my man so much. But i don't know why, i just couldn't imagine him cheating on me. I know him so well and i trust him wholeheartedly. although, almost all men i know, except my husband, has cheated on their partners at one point, my dad, my brother, and my friends and they are good people. But I'm still not scared of that one day my hubby will cheat on me, because I know he won't. Is it wrong to trust someone too much, eventhough your heart tells you to?