Wandering eyes...can anyone loan me blinders???

Tell me something... if I am truly wanting things to work out with R, is it normal for me to be EXTREMELY attracted to someone else?? I never had that happen before, when things were going well...
J is ex-military, very ambitious, very energetic... and VERY respectful... and has the longest, curliest eyelashes I have ever seen, outlining the bluest eyes...
Oh well... I just need to grow up, right? Stick with R, he is the father of my children... and he doesn't beat me (not in a bad way, anyway) and he doesn't hang out with the guys, and come home drunk all the time... and he loves me... that should be enough, right? Right.