If you're dating a private person, you must come to terms with the fact that they won't post you all the time.
You will go for an outing and they won't tell the world. You could get them a gift and they won't show it off. You must know that this doesn't mean they love you less.
If someone is obsessed with you, loves you too much, or cares too much, maybe they are just giving you the love they never received. If they text a lot, check in constantly, and seem a bit obsessed, maybe they are not trying to be a burden; maybe they are trying to give you the attention they never had. don't be mean to them for loving you.
remember... they are showing you the love they wished someone had shown them.