Sparkley:
This man is caught up in a cult that controls every aspect of one's life. This cult uses fear and guilt to control you. First, all of your relationships and support are to be fellow members of this cult. Then, if you violate one of their man-made rules, they will figuratively brand you in a practice they refer to as "disfellowshipping."
When a member is disfellowshipped it is made public to the rest of the members. No member, not even family, can speak with this person or render aid. When a member is disfellowshipped their entire life is turned upside down. This arrangement is considered "loving" in the cult and a tool to "readjust" the violator's way of thinking. Some members who are disfellowshipped desire to return to their regular status and can after a period of time, but only if they stop committing their "sin" and "repent".
Semitic faiths (Judaism, Christianity, Islam) use sex as a tool to control people. It is a well known fact that the majority of Jehovah's Witnesses who are disfellowshipped are done so for violating sex related beliefs. The number one sex related belief is that sex is to be had only between people who are married to each other.
One reason that this male companion of yours may be acting weird is that, deep down inside, he wants to return to being an active Jehovah's Witness. This would mean he would have to cut off all social ties with you, but especially in engaging in any form of physical intimacy. Sending sex related text messages to a married woman would be grounds for disfellowshipping on its own.