she dosent trust me

[commadore]

so my girlfriend and i have been together for about 3 months, things started great but about a month in i made a stupid decision, i started flirting with this girl from my work, and then me and her started texting eachother and it was like obviously flirting texts, i slept at my girlfriends house one night when i woke up she was standing there and told me to leave, she found all the texts between me and this other girl, she was not happy, she said that that night she started to really trust and like me, i told her it would never happen again, well i mamanged to keep her, a month later she told me she loved me, i said it back, things are going well, except every time a girl texts me she thinks i dot want her, this morning she found ttexts between me and a different girl that i have known for a log time, she came to my buddies get together an the texts werent evem flirting it was just talk, she got mad and told e to choose an stop two timing her, she didn leave to happy this morning, the thing is after that first time i flirted with that first girl i decided that i really want to be eith my girlfriend, shes really importabt to me, but she dosent trust me , and i dont blame her, shes hurting because thi has happened to her before, but i promiaed her im going to be faithful, and i have been, but anytimr i go take a shower or somthing she goes through my phone, i mean i dont like that but whatever, she crys in my arms somtimes asking what she did wrong, i feel so horrible, look i really love her, i know i ****ed up but thats the past, i want to heal the damage i have done cause shes worth every minute, any advice would be great, btw idk if it matter but im 19 shes 17