How can I make things right in a relationship?

So let me start by saying that I’m the kind of guy that naturally wants to talk constantly to his girlfriend and do little romantic things all the time; the “perfect guy” in my own mind. For example, I spent something like 7 solid hours on a card for our couple-of-months anniversary.

Unfortunately, this mentality isn’t working. Every relationship I’ve been in ends dully after a couple of months. My best guess is that I try too hard which exhausts our conversation topics and then makes the girl I’m with feel like she doesn’t have to try. If that’s the reason then the problem is that I don’t know how to deal with it. Before we’re dating the girl does all the texting and then once we’re together it sort of becomes my responsibility and I feel bad if I’m not texting her.

So eventually the relationship gets to the point where it takes forever for her to text me back or make plans with me. And I try to be myself around her so it’s not like it’s awkward when we’re together. But I get the feeling she doesn’t want to talk to me.

Overall, my dating history has proven that I’m doing something wrong in being the “nice guy” and I’d like to know how to fix this. Any suggestions? I’m pretty much open for any opinions here but please take it seriously. Thanks in advanced. Oh and by the way I’m in high school, just to clarify.

P.S. I’m sure someone’s had a similar problem before and I’ve tried to look into it but there’s so much sifting involved in finding specific relationship help. If there’s a similar question on Fluther or somewhere else on the web that anyone knows of a link would be helpful.