Nagging/strong gut feeling that boyfriend has cheated but I have no proof?

Anonymous
I have this nagging feeling for days thay my boyfriend has cheated on me. I do not think he has another girlfriend but I cannot help and feel that he has hooked up with other girls behind my back. I just cannot seem to shrug this off. We have been together for over a year and I have asked him actually many times if he has done anything and each time he denies it and says he has done nothing and will do nothing. But why do i feel this way?
I have caught him searching up girls on Instagram, both girls he knows and girls he does not know. Some of them he has searched up many times. He also followed a woman with naked pictures when we got into a fight and it made me think what else does he do when he is angry? He says he would never do that to me and hook up with someone but i can't help but feel this way. It comes and goes. And I don't know if it my insecuirty or what
I don't know what to do?
Nagging/strong gut feeling that boyfriend has cheated but I have no proof?
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