Hiya OP!

I too play with my SO - tank/healer combo. I have to admit - not playing heals with any other tank has made me a bad healer because I know his moves...I know what he's gonna do next because we do SOOOO much together. I got too comfortable in my role, and then we ran WP with another tank so he could practice DD. OMG - it was like I was the noobest of noob healers - new tank didn't care if I accidentally regen'd too late and it didn't wear off before the next pull, or wasn't keeping an eye on my MP if I was low before or after a boss fight. I started running dungeons with our FC but without him - ya know what, I'm a better healer now because of it. I'm not gonna say I'm super awesome, I'm not and I have a lot more learning to do, but I am a lot better than I was. I look at the Duty Roulette as a way to grow as a player apart from my SO so that when we do play together we have more flexibility and I'm more confident in my own role. GL and enjoy Eorzea!