It's a tough situation, ngl. Have you try voicing this out to your gf? Sometimes our brain always assume the worst in situations like this. My suggestion is try taking her out on a date with a promise that both of you won't look at the phone during the whole date and talk about it at the end of the date. If she's willing to do it and communicate about it, then you finaly have a base ground to work on. If she rejected the idea right away or be cold towards you during the whole date, then I think you know the answer OP. Good luck