<human>: Can you give me the gist of the text in a nutshell?

I do apologize ahead of time, I have a hard time putting my thoughts into words.

Well as the title says I have not been in a relationship in around two  years and my previous relationship lasted right around two years. I have tried dating sites like [Plenty of Fish] myyearbook (I think it's called MeetMe now), OkCupid, etc. About 90% of the time I message someone on those sites I don't get a reply. The times I do get a reply we chat for a bit and I never hear from them again.

I have been lucky enough to receive phone numbers previously and usually at first everything seems to go fine but slowly the texts always tend to fade before I stop getting replies entirely. Not sure entirely what I can do to help with this.

The very few times I have been able to build up enough courage to actually ask someone on a date about 45% of the time I get a yes. Usually the next day or the day of the proposed date I get a text saying that something has suddenly come up. Every. Single. Time. I'm not sure if I am just being sensitive or if I am legitimately doing something wrong like texting too much or texting to fast or whatever. 

Whenever I talk to people in person it always seems to go pretty well at first, the phone number usually comes fairly easily. After a while the same thing happens. We text for a bit until slowly but surely the texts stop entirely and if i build the courage to ask them out excuses flow more than water through a faucet.
<bot>: Haven't been in a relationship for about two years, have tried multiple dating sites to no avail. Can usually get a phone number but slowly the texting in general stops every time. Not sure what to do