As of the New 52, not really.
Robin would still be in love with Starfire. But he would have met Batgirl, and fall in love with her too. So probley he ends up with Batgirl. DíckXBabs Forever!
yes he does, in the movie they end up dating and after that and they're all older starfire marries robin, beastboy and raven get married, and cyborg and bumble bee.
Starfire because in a episode starfire kissed robin.
yes
Raven was not in control of her new found emotions (which she hadn't had until her third life) and when she got angry and jealous of Starfire and Robin's marriage (since she was in love with Robin, or so she thought, at that time) she lost it and killed the minister.
Starfire and Robin have a romantic relationship in some versions of the Teen Titans stories, but their feelings for each other can vary depending on the specific comic series or TV show. In many iterations, they share a deep bond and care for each other deeply.
Yes, but at first, he didn't think it was appropriate to have relationships with teammates.
In the comics, Robin is suppose to get together with Starfire. But as they show in the cartoons, Robin shows much more passionate moments and feelings of love towards Raven. It's a bit confusing so I guess it will be up to you to choose.
Haunted.
Yes, in the comics.
Yeah.They did.
Yes.