Ungrateful spouse
If you are married (or have ever been married), the phrase "ungrateful spouse" can pack a real punch. Even the happiest of couples have these types of feelings from time to time. No doubt in any relationship there will be times when the "give and take" of a happy marriage falls out of balance. Some people just stay in "take" mode a little longer than the "giving" partner would prefer. Generally, the intent of one spouse is not to be ungrateful of the other spouse, communication and having an attitude of understanding are two key elements to ensuring that feelings of being unappreciated or undervalued stay in check.
Marriage brings all kinds of wonderful things, like new family, sometimes children, a companionship, etc. However, one of the things it can also bring is jealousy, and problems with your family. For example, maybe before you got married you spent every holiday or weekend, etc. at home with your mom, dad, siblings, etc. and after you get married, you choose to spend more and more of your time with your spouse's family. Maybe they have more fun options, or do cooler things, or maybe they pay for you to do stuff, etc. Either way, it is important to remember when you get married that you are not replacing one family with a new one, you are gaining a new one. This means that you should not neglect the family you come from, or the family you gain, instead you should be very conscious about splitting time evenly between the in-laws. 