My best friend has FWB that she meet online?

My b/f has a FWB she claims they are not serious but wouldn't mind if it did became serious. both of them have been divorced for less than a year. She meet him on AFF about 5 months ago. Here the thing. They talk on the phone for at least an hour every night. She see him at least twice a thou the week and once on the weekend, they go out to the movies, dinner or just sit around his house watching movies or partying with him and his friends, Everytime they see each other out somewhere he always gives her a kiss. Like last week she had a flat tire w/no jack so this guy and his buddy showed up changed her tire and he gave her a huge kiss before he left. She has even told me that when they go to the movies or are at his house watching tv that either he will hold her hand or put his arm around her. IS this normal for a friend with benefits to act this way? This weekend is met his Aunt and some of his cousins. But he will not allow her around his 3 kids?