Yeah, my wife's first EA in 2005 had the same progression. Their messages after I first asked her about who he was were classic, him being a knight in shining armor. He had one goal, to get her into bed. When she told him I was suspicious of them he went into this "Oh wow, this guy sounds wound too tight." "He is holding on for dear life!" Etc.
Not sure about the one at the end of last year. He was just a younger (than my W and I) guy that had no other prospects in life and was trying to be someone he wasn't on the internet. On FB he had listed "attended such and such community college studying just about everything". When I ran a background check on him he had dropped out of high school and had gone through the community college's GED program! ROFL
But I am sure it was the same approach. Befriend. Play into her feelings with acquired info. And then tried to be a rescuing presence. The messages I found on BD were her telling him she didn't mean to get between him and his girlfriend. And him saying he wasn't sure he wanted his GF anymore because of her. Typical player line. Of course, his girlfriend was in her early 30s and my W was almost 50. And while she is very attractive, it is hard to compete with a W 20 years her junior. So eventually the OM let her down easy after he'd had some fun.
M(53), W(54),D(19) M-23, T-25 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018