I'm a massive fan of Belle and have been since she arrived. She has flaws and weaknesses which I feel make the character believable. What we've seen recently in Australian pace episodes is the return of her fiesty side with the development site and her determination to help people which I don't believe Aden does anything to stifle. Her relationship with Aden, in my opinion, has always been believable and far better than her other pairings with Ric, Lucas, Drew and Angelo. I do feel sympathy for Angelo, I like his character just not necessarily in a relationship with Belle, I find the Aden and Belle relationship so romantic (at the risk of sounding very girly). I think todays episode especially highlighted the bond between them which to a lot of viewers is amazing to watch.
When the actors and the characters have such genuine and exciting chemistry it really is nice to watch, there is always going to be plenty of angst in a soap but the romance is an essential part. Couples like Aden and Belle, Jack and Martha, Tony and Rachel etc will always have massive fan bases because as a fan you become invested in the relationship.
Saying all of that, I also get why people don't like Aden and Belle as a couple whereas the frustration for a fan is fun and exciting, the frustration for someone who doesn't like the pairing and the 'on-off' relationship must get annoying.