What are you fearing  at!??? Loosing her!!!! I would suggest you to have a talk with her directly and have  a clarity. If it is just your feeling,  then,  I think you are Confused between various reasons.

Sorry to hear about your situation. Without sounding patronising and judgemental, I wish to reassure you that all relationships are built on trust and openness. Hence it would be helpful to have open conversations with your girlfriend. Best wishes.

Hello dear, See being suspicious or doubtful about your partner points towards your insecurity..which is not good for any relationship..Also if some incidents occurred in past that raised ur doubts then discuss with her in detail about it...It's better to clear the air then get disturbed with it... Consult a Psychiatrist if it doesn't work..done