4. Izzy doesn't know what to say when Johnie opens up about her ex's drug overdose, so he says nothing
Izzy clearly seemed spooked by Johnie's complicated romantic past, even though he revealed previously that he was also engaged, and assured Johnie multiple times that things between the two of them in the pods were good.
But despite Johnie being completely vulnerable with him, even crying when talking about how she doesn't take life for granted, Izzy isn't able to get past the fact that she was once in love with someone addicted to drugs, and remains largely silent when Johnie continues to pour her heart out to him. He even seems visibly annoyed when Johnie says that she's "deserving of love," despite being a "walking red flag" due to her past relationships.
It's definitely an intense conversation, and it's understandable that Izzy would need a moment to process. He's clearly judging Johnie for being open with him, however, and even though she reassures him that she's falling in love with him, he completely makes the conversation about him, and even tries to blame Johnie for telling him this too late.
Overall, it's an emotionally charged conversation that becomes excruciatingly awkward to watch when it's clear Izzy wouldn't be able to handle Johnie's past.