i wouldn't beat yourself up over that. i don't know how you feel since i really love this webtoon, but when this happens to me it's usually cuz i'm not invested in the characters or because i've been reading too much and am kinda numb to it all. Try taking a break from reading and then coming back to it. If you still don't enjoy it then perhaps it's just not for you.
It's difficult to maintain enthusiasm when a series releases a single short chapter every week. Since not much happens in a single chapter, is hard to keep the hype. I usually solve this by letting some time to and some chapters accumulate, or by bringing all the available chapters to revive my interest in the series. It usually works.
Okay I'm probably the only one who feels this way but this whole story is starting to become white noise to me. Like I would read it and be like okay then and I'm not excited anymore whenever I see if update and that makes me upset because it feels like km slowly losing interest when I shouldn't and now I feel bad.