I made this girl feel unsafe and I don't know how to fix it?

so i went on vacation with a girl i know for about 6 weeks.
it's a fling, type sitatuation. but one evening we were sitting in a restaurant on the resort when she was calling w/ some other guy. the whole situation made me feel extremely disrespected, her reaction didn't help it either. but basically it all lead to me throwing my phone away in bed. and that made her feel unsafe. i feel very shitty about the whole situation because i liked being around her. not just for sex. she didn't like me more than just for sex and as a friend, but now that's over. she also let it slip that this is the main reason. i have already prefusely told her i'm sorry about it. but i just really want to fix it. i know that would be very hard.

Updates
1 y
i've been eating away at myself because of this.
i have autism and ADHD and this was an early child thing i always did. i would self harm to feel better about myself. and this was one of those things.
I made this girl feel unsafe and I don't know how to fix it?
Post Opinion