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Keep your promises and be responsible  Be sensitive when you talk about female friends. Tell the truth about important issues but know when little white lies are appropriate. Confide in her. Have good online and phone etiquette. Defend her in front of other people.
Be punctual, maximum 10 minutes late ever, and make it a priority to keep your word to her and also to other people. A woman that sees that her man cannot keep his word, regards him not safe enough for a serious relationship. If you are hindered to keep a promise, warn about it in time, and make up for it afterwards, so she sees that you are a trustworthy man. A broken promise is often seen as the same as a lie. Asking for forgiveness is better than a lame blaming of circumstances. With time she will feel your real priorities. Show responsibility with studies, work and money. That signals that you possibly also could take responsibility for a family in the future. An irresponsible man can easily be seen as ridiculous and not a stable partner. If you have female friends that you would like your girlfriend to befriend or if you want her to trust you in your friendships with other women, never compliment your female friends' physical attributes.  If you have something positive to say about a female friend, say something about her personality, as in, that she is warm, friendly or creative. Or when it is really obvious: smart, famous, sporty etc. Whatever you do, don't lead in with, "My friend is coming to town and I really want you to meet her. You'll really like her. She's gorgeous! All of my friends can't keep their eyes off her - when she's around, conversation stops because all the guys just keep staring at her!" Understand that your girlfriend may be suspicious of your female friends at first. Always uplift your girlfriend so that knows that she is the only one in the world that you have eyes for. Your friendships with your female friends will be accepted much more smoothly if you follow this step. Avoid much contact with female friends that have no stable relationship, but possibly mention that she could be a good partner to someone else. Talk about the female friend mentioning her boyfriend/husband too. Major lies will drive a wedge of suspicion and mistrust between you and your girlfriend that you may never be able to fix. You may throw away a whole relationship with just one act of mistrust.  Show her you're trustworthy by your actions. Conversations you have with other women should never border the line of being flirtatious or intimate. She needs to know that she can trust you in speech and conduct even in the little things. If you have a hard time with this one, maybe you aren't ready for a relationship and should instead question why you feel the need to flirt with other women in the first place. Regard other women as humans only, not potential partners. When you are in a relationship, never tell her that another woman is prettier than she is. If she asks you whether another girl is more attractive than she is, then your default answer should always be a resounding "NO!" Never talk about how you find some celebrity really gorgeous. Doing this will only make her feel bad about herself, and she will resent you for it. When you do feel the need to comment on the beauty of someone like Angelina Jolie or Scarlett Johansson, always remind your girlfriend that, in your eyes, she is more attractive. Open up to her in a way that you don't do for most people. When you show her that you trust her, she's more likely to trust you back. Keep her secrets when she does the same for you. You can show your girlfriend a side of you that you don't normally share with your buddies. Don't tell others about private things that could upset her if she would find out about it - protect her dignity. When you’re in a relationship, make sure that you say so on your Facebook account. Be proud of her so that she'll feel confident in you. Show before your family and good friends that you are serious about her, that she will not fear that you might be seeing other girls.  If someone hits on you online, tell your girlfriend right away. If you keep a secret from her, and if she is already insecure, then hiding your secret will make her insecurity worse. Avoid communicating with other girls over e-mail, text or social networks without letting your girlfriend know what you're doing. If you're flirting with someone else via text message and your girlfriend discovers your texts, then she's going to be furious. Invite her to take an immediate look at your mailbox if she has doubts. You must make sure even for yourself that you have chosen her, leaving all others girls aside, or she will probably feel it. If someone is teasing her, take her side. Girls need to know that their men have their backs at all times, it is an age-old need. How would you feel if she took her friends' or your friends' side over yours? Let her know she can depend on you to stick up for her. In the long run, it is often the man needing the most support in life, so it is wise to show your readiness to "take any bullet for her". A man's bright career is easily ruined if his woman doesn't support him.