First GF dumped me two months ago to go marry a rich guy her parents choose.

Met a new girl in my program. Talking to her, flirting over snap, and talking to her in class (we have every class together). She just got out of a 4 yr relationship (think the guy dumped her). Checked out her ig, full of pics of the guy and their dates. She seems pretty loyal/non-slutty, very adventurous and non camera shy. Previous gf was an introvert, never let me take pics, didnt have a social life at all. Finally found a girl who is into fitness, but i want a girl who has the same interests (getting fit and cares about her body, if that makes sense)

Question is how can i avoid falling into oneitis again because i have a good chance but circumstance be we are in the same program dont wanna fuck anything up and have to see her again for next 2 years. That being said, should i treat her as a plate? She genuinely seems hurt from her breakup and i dont wanna go in with the intention of leaving her hanging a few months down. Definitey was HER first breakup, and mine as well (mine lasted 4 months)