There could be a million other reasons you're getting easily annoyed with your partner.
If one of the following statements resonates with you, then you know it's time to make some hard choices: At the beginning of the relationship, you weren't even aware that you needed to make time for your partner.
You might not even know what you want yet, and maybe you need some single time to figure it out.
Maybe you feel guilty for abandoning ship when you used to profess your undying enthusiasm for the relationship and investment in a future.
You feel like you have to change around your schedule in order to see your partner, and when you do, you feel frustration.
You know that you should be looking forward to spending time with your partner, and maybe don't know how or why or when that feeling stopped.