The first photo I saw of them together on FB, was June of 2011 (They'd started dating Aug. 2010). He was 17, she was 13. If he'd been 25, then I'd be more inclined to think it was nefarious to start out with. I just don't see it at the ages, when they were permitted to start seeing each other. Especially since that age gap is not uncommon, still, for this region.
I think he liked her outgoing personality, mostly because he didn't have one, and he had few friends, too. She had friends. They likely met through their parents, at church maybe, or at BBL. She was fun, they liked each other, and the friendship moved forward.
I believe things changed when she had S, though. Having a child, young, can ostracize a young girl from doing things that young girls normally would be doing, who are not tied down at age 16, raising babies. As FR's first gf said in an interview, she and FR were young parents, (17), and FR still had fun on his mind, and she was at home with a baby. It didn't work out. It's all good for the male to go about his business without his gf/wife,while she's left sitting home with a newborn. Eventually, though, his shine will begin to fade, especially if she is of an independent nature, and she'll move on. I think JW's shine began to fade, he possibly even got caught cheating, his Mommy and Daddy moved in, and HMR said, Sayonara. Losing HMR was hard enough, but then the thought of another man raising S, was the tipping point, in two families who had already fell out with each other.