Whenever I meet a girl I like, I am finding that it starts off well and I can get a good rapport with them but then they seem to lose interest and I find myself chasing them. It seems that I am coming on too strong. Is there a way to fix it?

Just an example. I met this girl and starting texting her and calling her. was getting on well and then finally went out with her and had a great time. She even said it was the best first date shes ever had. That was about 3 weeks ago and since then I have barely got anything and now it even looks like she is about to date another dude.
I don't know where it went wrong?

Did you "close" the date? in any way? Did you call and text 42 times a day?

_________________
They call me the cat whisperer, cause I know exactly what the pussy needs.

What was the interaction like when you originally got her number? Did you obtain it quickly or did you spend time building rapport with her? How long from # to date? As previously asked how many times did you talk, did you text? Where they to the point with furthering your process or was it just fluff talk? How'd the date go? Was there any follow up by you or her via phone or text after the date?

_________________
Been around the world twice, Talked to everyone once...

Well I went for a kiss close and she laughingly said no kisses on the first date.

And no I definitely try to avoid texting and calling that much. If she isn't responding with text well I tend to leave it.
She admittedly is really bad at texting and can take a long time to write back. Maybe it's true, maybe I am being naive but I have definitely tried to keep it up but to no avail really.

It started with facebook and was infrequent but friendly enough and then i gave her my number and then like that weekend she texted me. It was about a month between when I got her number to our date.
Since it was difficult texting her. I called a few times and one of those times we were on the phone for 2 hours just talking about everything.

the date went brilliantly (or so i thought) It wasn't awkward at all, we were both laughing, having fun. She said it was the best first date shes had. She invited me in to meet her roommates after, we agreed on what we were going to do for a second date even. After that I left it for 4 days and then that about was 3 weeks ago. Since then I have texted her and intermittently with not that great of a response. And only a couple of days ago I see that she is planning a date with another guy.

Sorry to hear that. Sounds like you had a good time but she may not just be interested in you that way. You can either try to call her and see what you can do to get her interested again, provided she answers. OR you can accept she's going out with another guy and move on.

_________________
Been around the world twice, Talked to everyone once...

Never stick to one girl. You should have girls lined up so you can keep on getting more experience. This situation seems like she just lost interest.