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i think you are misreading it. he said "don't push me away too much or you are the one who will get hurt" in the sense that Seo will end up hurting his own feelings if he forces himself to push blondie away. and blondie even starts the whole conversation with "I won't bother you anymore and I'm okay with whatever relationship you want" I don't think that's guilt-tripping, especially when he's literally gonna live for Milan for 2 years
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also in full honesty I'm on blondie's side with or without this conversation about the whole just-move-on thing because seo is not confirming jackshit. im not saying he HAS to return Blondie's feelings but he's not rejecting him either and then he goes and has sex with him again and it's just very messy. especially considering how much blondie likes him, with the whole kidnapping and all situation and everything blondie did for him. im still not saying he has to return those feelings but at least make it clear
The communcation is just foul between them, not baek trying to trip guilt him
Seo has the right to be uncertain and scared even if it hurts baek, it's a human thing one has to process
these two messes ayaaa