This might just be my opinion…
I am currently rewatching Chicago Fire for the 4th time lol and I cringe every time Dawson and Mills are together. It’s so incredibly awkward because it’s obvious to literally everyone that Dawson is in love with Casey. Her friendship with Mills was amazing, but the drunken 1 night stand turned relationship icked me out. They were such good friends and their relationship seemed so forced. It seems like Mills really likes Dawson, and she’s forcing it because she doesn’t want to make things awkward at work. I don’t really like her relationship with Casey either though. The way she creeped around in the background waiting and wishing for him and Halle to break up was such red flag behavior. THIS IS JUST MY OPINION so please don’t come after me in the comments.