It’s not so much about fault but rather poor communication. Maybe do a video call and have an honest conversation about what you both need to keep this relationship going…. Make sure you’re both actively listening to your own needs and each others too.

Hey, I agree with Matěj, relationships need communication and respect to survive, long distance relationships are especially challenging (I know from experience.) as long as you communicate that you won’t be communicating because of whatever is going on in your life, so they know where they stand, then you’ve done your part.

You did good on your end. He should understand that you were really busy and he should support you and appreciate you for seeing your project through. I've never had a long distance relationship but it must be hard to maintain that. But you didn't overreact, I'm on your side Hsu✨!