Girlfriend wants to move to the city

TL;DR,

My girlfriend just got a job in the city, requiring her to be in-office five days a week. The long commute and possibility of her moving there have me worried about how it'll impact our relationship. We’re really close, have talked about a future together, and she reassures me she's committed, but I’m anxious about us having less time together and if it could lead to a breakup. She thinks we can handle this challenge, but I haven’t fully expressed how scared I am. Am I being insecure, or are these valid concerns?

Girlfriend wants to move to the city

Me M(23) and my girlfriend 24 have been together for about a year , and have essentially lived together for a couple months now. I am just starting to figure out my career and finally found something i wanna do thought it will take time to get through school (year or two) so i’m bartending/interning while going through courses. She is working for a big financial firm and is very successful and just landed a job in a new team that will propel her career further . She is super supportive of me and loves me , when we argue it’s honestly more so communicating. We never go to sleep to leave mad at each other , she reassures me all the time and basically gives me no inclination that she’s gonna leave me. This new team requires her to be in the office 5 days a week and it’s a 60 minute commute and another 60 ish back every day , she’s up by 5 to get ready and out the door by 6 . This team and the commute kinda require her to be in the city and so she’s been wanting to move out there but half of and renewed our lease, a situation arose where she will probably be able to terminate the lease at no cost if she found a place in the city ( i have an apartment with friends in this town we currently live in so i’ll be fine) . Though every time i think of her moving to the city i wanna cry . We spend everyday together , eat together sleep together shower together . i thought i’d have another 6-8 months with her now it may be a month if she finds a place . I feel like her moving to the city nah result in us breaking up because of all the possibilities out there for her , her friends live there a lot of them being single which scares me . Wed going from seeing each other every day to maybe 1-2 times a week. we both see a future with each other in terms of marriage, does that mean it will 1000% no but we see as a viable option. She always says if we can’t get through something like her living in the city then what happens if another hardship arises down the line . i’m just really scared man , she doesn’t know the full extent of how scared i am in terms of her moving and my reasoning . i need advice on if im being insecure or whatever . I will never tell her to not move to the city because her career is priority. I’m just lost and need guidance guys . Thank you .