Neither were in the right frame of mind to have a healthy relationship. Wouldn't have made sense to me if they were a couple at the end, instead they made a pact to support one another implying eventually they'll be together when mature enough to handle it. A relationship takes a lot of effort to sustain and they weren't ready for that when they could barely even support themselves.
Who's the 2nd girl that liked Satou? Hitomi was just using him to get over her boyfriend. She's a reason for his mental decline
An unhealthy relationship is better for a NEET than no relationship. No way is someone like Satou whose never had a girlfriend turning down a relationship because he's not in the right frame of mind. No 22 year old male virgin is turning down sex like that. The easiest way to get back on track would be to get together especially since they both admitted they love each other.
The most basic rule of writing is don't tease something you won't eventually deliver and they teased and teased and didn't deliver. If they didn't tease a romance I wouldn't of expected one and would have been fine with the ending. Instead I kept saying "I hope they get to the relationship soon" after each of the last few episodes.
Hitomi almost had an affair with him despite supposedly being happily engaged and just finding out she's pregnant. She was willing to ruin that for a fling with Satou. That is what I would call an unhealthy relationship. I think two people on the same level with similar mental problems like Satou and Misaki could have a healthy relationship. Their friendship is already "healthy" and it's not like they know anyone else they can use to hurt each other.
Loved NHK and the 2nd girl never truly cared for him, she was just using him to get over her relationship. TBH the chances of Satou finding a girl that perfect to cater to his needs in Miskai was unrealistic in itself so even tho I agree they should have put them together in the end after all the these teases that didn't make the show unrealistic to me. I did think Satou was a bit of a dikk at times even if the audience was supposed to sympathize with him. like
@Consumed said chalk it up to Satou not being ready for a relationship
Just finished Geass in full, one of the best endings I've ever seen in anime
It will always be unrealistic for two people to both admit they like/love each other and do nothing about it. They didn't even acknowledge that Satou told Misaki he loves her. They both just kept going on with their usual life when what they need more than anything is someone outside of their family who really loves them and is always there for them. A relationship is the best way to do that. You can say that their not in the best frame of mind but how are they going to get there if they don't take their relationship to the next level? I doubt their ever going to overcome their problems by just being friends.
Also I would argue that Misaki got over her problems, at least for the time being she can blame God for all of her issues, and Satou was forced to get a job, so he isn't a NEET anymore. They both made enough progress to where I think they would be able to be happy most of the time if they were dating. A close relationship is really the one thing their missing.
Satou is definitely a dikk, he almost punched Misaki for no reason and then after stopping her from killing herself he immediately goes and tries to kill himself. He even declined her relationship contract.
Code Geass is the exception to the unwritten rule "all anime endings must be a disappointment or non ending." It's a shame their going to ruin what was a perfect ending with the new season this year.