Honestly you’re coming across as a bit needy. It’s been four months, you’re both young, he wants to enjoy having his own life. There really isn’t anything wrong with that, a healthy relationship involves respecting that you’re each still individuals. If you value the relationship then give him some breathing space, you want to compliment his life not take it over. Discuss setting aside certain times for being a couple - FaceTime every other evening, set up when you plan on physically being together, if you can’t call then text. His blatant lack of response to your texts so far at some points has been a bit shitty (provided you aren’t spamming him); if you think after a while that you’re no longer compatible in what you both want in a relationship then move on.