The Summer Bay duo - who became an item late last year - will see their romance coming under increased strain as the soap's 2011 storylines progress.
Speaking to TV Week about what is in store for his character, Mitchell explained: "There are a lot of interesting times ahead for Romeo. A lot of relationship stuff, a lot of ups and downs. He goes through a really torturous time. It's a very rocky path."
The actor confirmed that Indi (Samara Weaving) being at university while Romeo remains at school will be a particular source of tension in the months ahead.
He said: "That doesn't help a relationship because the reason Romeo's still at school is because he failed the HSC to be with Indi, which turns out to be a spanner in the works from the get-go. Indi goes through a pretty hard phase as well. There's a bit of drifting apart. They're both just trying to balance things out, trying to work out what's really going on."
Meanwhile, a teaser clip recently released by Home and Away bosses shows Romeo kissing Ruby Buckton (Rebecca Breeds) as part of a new love triangle storyline.
Speaking of the twist, Mitchell said: "I saw the teaser and was like, 'Wow, that's certainly going to raise some eyebrows!'. She decides that Romeo is the guy for her, but time will tell if this is actually the case."