Help!!!!!

Okay so I have been dating a guy for about a year and a half. Everything has always been great, we have of course run into bumps along the way but that's what comes with any relationship. Anyways, he recently helped his dad build a home for a young couple, probably late 20s (keep in mind we are 19). Well apparently the wife and the husband have decided that their marriage isn't working anymore. So this wife has been asking my boyfriend to come over acouple times a week to move stuff in to their house, paint furniture, etc. SHES A STAY AT HOME MOM, how useless can she be?? Not to mention she's GORGEOUS. Am I being completely crazy for thinking something else could be going on? My boyfriend won't budge on not working for her anymore. He gets annoyed with me when j get annoyed when she texts him. And today, she accidentally sent my boyfriend a text that was meant to go to her husband, basically confirming that their marriage was over... It just doesn't seem to be a coincidence. Also, my boyfriend doesn't seem as interested in me sexually anymore... I mean I have never felt less sexy in a relationship in my life... Am I going crazy?? Reading in to it too much??