1. Changes in physical appearance and upkeep - we all know the longer a couple is in a relationship, the more comfortable they become with each other. Looking your absolute best at all times can often takes a back seat when you're just hanging around at home or going to sleep after a long day. Lingerie getting traded in for sweats sound familiar?

If your husband begins to pay more attention to his physical appearance and is doing things like buying new clothes, wearing new more cologne, tanning, joining a gym or getting his teeth whitened - there's a good chance it isn't for you. If he's not already seeing someone else, he may be readying himself to find another. Unless there's a big event on the horizon like a wedding or reunion, ask him what's up with the sudden interest in manscaping.

2. Being too nice - this one might sound a bit silly. Who doesn't want their partner to show them extra affection and attention? However, if this attention is out of the ordinary and doesn't seem to be sparked by anything in particular, he could be making up for guilty feelings and/or distracting you from his inappropriate behavior. Showering you with gifts, calling and/or texting you multiple times a day to "check in" or "say hello," planning expensive dinners and dates, sending you shopping with his credit card, going on a spontaneous vacation -- these are all red flags. Don't be blinded by the rush of that new wallet and matching shoes or the relaxation of a spa visit - find out what's really behind the excess of generous gestures.

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