going out with a girl and I got a lot of question

so I have been going out with this girl for about a month now and its pretty weird
we didnt hold hands yet but we did talk about holding hands together
she is bi and always flirting with other bi girls or guys which is making me insecure but I have known her for a while before we started dating and I know I shouldnt be insecure but still
we told eachother that we love eachother more then once
we gave eachother new years gifts
we were friends before we started going out and it doesnt feel like we are moving farward
I feel like I know she is going to end it but idk why I feel that way or why would she end it

please try to answer most of the things im confused about and thanks for anyone who does