Don’t let guys get in the way of study. A good guy never will.
The worst will interrupt you all the time so you can’t get anything done. Will make drama that distracts you from your aim. Might even get nasty and sabotage you if you persist. Might start using put downs.
An example of subtle sabotage is organising an event when you have classes or work to do and expects you to come.
Do not blame yourself. If he is out the house and you are in no danger be done with him and get to work.