Need advice: dreams of other men

Ok so I've been married for almost 10 years, but a few years before getting married I broke up with my now-husband for another guy. Long story short the other relationship didn't last long, got back with the now-husband, married a few years later. 
​But every so often, more so lately, I have dreams of this other guy. Then I wake up and want to contact him. But I know I can't because I don't want to hurt my hubby. It's crazy because it's been over ten years so why do if still dream of him??
​Now, I'm dreaming of another guy I just met who I think is pretty attractive. Ugh! I love my husband very much, but these dreams... Are thy harmless or ... ??