In reality, we know our significant other’s exes do not matter, for now they are just a compilation of memories (or, they should be). But it’s hard for us to see it that way when we are giving so much of ourselves, emotionally, to them, and realizing that they’ve been in this place, with another person, before.
There are times when they will neglect you and give their book the utmost attention. You will get frustrated, and you will feel second best. Wait it out.
Look to the future, to the time you’ll get to spend with each other, rather than dwelling on your situation. It is completely okay to let your SO know that you miss them and school, but if that’s the only thing you talk about you’re going to overlook potential opportunities the two of you have to grow as a couple now.