Don't brag about your relationship
Girls tend to brag about being in a relationship. Sometimes they get excited but to some it could be annoying.
If you are in a relationship it is okay to talk about it and be happy but there comes a line when enough is enough. You don't need to take 10,000 pictures of you and your boyfriend and put it on Facebook. It's okay to write on his FB wall once in awhile if you love him but don't over do it. It may make him look like he is sipped and you might come off as being clingy. Don't thank him on FB what he buys you. If you really are close send him a text message how much you care and how much he means to you.
Don't go around making single people feel upset. Just because you have someone doesn't mean other people do. How would you like it if you wanted someone and someone else was always bragging about their boyfriend to you?
Real relationships are based on trust, communication and compatibility. When you really love someone you are able to talk about anything with them. You could have deep conversations or inside jokes that the both of you share together. It's not what you do when you are together it's the fact that you are with the one you love and he loves you back. When you love someone just seeing their face gives you a rush of excitement. So think about it before you go overboard just because you are in a relationship.