Hawks and Dabi probably know nothing about the others past love life before each other. Dabi will once and a while mention his but hawks didn't have one before Dabi so he doesn't mention it
...
Dabi: keigo
Hawks: hm
Dabi: how long have you had mating season
Hawks: I think I was almost 14
Dabi: that's like 10 years
Hawks: yeah
Dabi: damn. How many partners have you had to side with the years without me
Hawks: none-
Dabi: none. How? Youre attractive im not gonna lie. How did you get through 7/8 years without a mate.
Hawks: ha- yeah- I did it myself- The only time I slept with somebody was when I was like 21/22. I was drunk and I don't remember it so I don't think it really counts. I've had girls hit on me in bars. But I'm gay so no thank you
Dabi: and that's why you're mine