hmmm that's a good question! lily would have already felt terrible breaking up with him so she might have been vague about it and did the whole "i don't think i can do this. i'm so sorry. it's not fair to you." ev only came back into her life very recently (like may) but since he would have known that he was her hs bf that's definitely a possibility. she started dating the baby's dad in november of that year and got pregnant almost immediately and they were on/off until march i think? basically on paper lily knows that she looks like a mess lmao she'll honestly probably think the reveal about the two kids is some kind of karma