Being grateful is the most important thing. You should be able to value your partner and his/her efforts. Also, trust is another important factor. Law of attraction states, You attract what you feel about something, so one should keep negativity out of the door. Once, you are insecure or start to feel negative about someone, then it gets really hard for you to gain the same equation and love back. Make sure, you are attracting and concentrating on their positive aspects more than the negative ones.