Why do i always feel my boyfriend is cheating or he hates me?

he is the best boyfriend i've ever had in my entire life and i love him with my whole heart, and he says the same. he tells me EVERYDAY that he loves me and that i'm beautiful, seriously, everyday since we started dating, and it's been 7 months. he is so sweet to me, so thoughtful, everything i could have ever asked for, yet, i seem to be paranoid about him cheating on me. i know i have some predisposition since my father and a few of my uncles are serial cheaters, but why the one i love most? is he really pulling the wool over my eyes or am i?