<human>: I feel unequipped to handle my gf's jealousy and insecurities, which generally grow from small issues or miscommunications to insinuations or outright accusations of infidelity. She has had issues with boyfriends cheating in the past, so I understand the underlying issues - however I am a bit tired of being treated like I am a cheating when I am doing no such thing. I have asked myself what have I done to trigger this behavior, attempted to defuse the accusations by being one hundred percent honest about what I was really doing / thinking, offered to remove myself from situations that I think should be acceptable for either one of us but seem to trigger these issues.

She is incredibly smart, problem being that she can basically convince herself that all the pieces add up when in reality, they don't. 

Though I never considered this a deal breaker, it is slowly becoming one. 
If anything, I'd love some tools to deal with this constructively before I run out of energy.

Give me the gist of the text in a nutshell
<bot>: GF gets insecure over small issues due to past history, leads to accusations of cheating. Looking for some help or advice on how to defuse this.