Is this my self esteem “talking” or my intuition “talking “

Trying to not overthink. I’m starting feel that my boyfriend is cheating. I have no proof. But maybe about 2years ago or longer I have seen from previous msgs he was flirting around with different ladies after this we had a huge argument then I was finally able to calm down and communicate about it, got pasted it. I have been with him for 5 years now. N just recently I have just started having feelings again but no proof. I have to confess I have had thoughts of stepping out on him in our relationship, I have searched in his phone bc I have his code n my thumb print is on his phone, I have even recently thought of using a hidden cam in the house, sometimes my mind is all over the place. I have recently had a conversation with him and he says I’m not doing anything, or what do I need to show or do so you can trust me. His actions shows he love me threw his affection and time he gives me. But those words are not enough for me at times.

Advice pls~~