CHESSNOID

Yes, they are still together judging by this Good Morning America video. Molly didn’t really look that into Jason or she was just bored on the show, at least when he was talking about his website for single parents. Originally, I thought he was going to be on ABC to announce wedding plans [...]

No, Jason didn’t dump Molly to go back to Melissa.   Melissa is instead engaged to her new boyfriend Tye Strickland. I am glad she found someone and wish her happiness.
Dallas News:

This time, the proposal sounds like the real thing for Dallas beauty Melissa Rycroft. She is the former Dallas Cowboys Cheerleader famously proposed to on [...]

There isn’t a lot of news out there for past bachelors.  I get a lot of hits still for Jason and Molly.  The only thing I have seen recently is from BuddyTV.
Despite previous reports that the beleaguered Bachelor couple Jason Mesnick and Molly Malaney has already reached a rocky stage in their relationship, according to [...]

Just read that a former bachelorette Jenn Schefft recently got married to Joe Waterman.  She was the one Bachelor Andrew Firestone picked in the end during his season.  They broke up later and Andrew married an actress Ivana Bozilovic later.
Also saw this news clip on Jason and Molly stating they are still together from E.Online:
We [...]