Happy I could help you ready2improve and I hope this put your mind at ease a little. Since there's many different causes / kinds of erectile dysfunction, it can be confusing. When you end up not being able to finish the traditional way...the first thing that pops in your GF's is - maybe she's the problem...not attractive enough etc, etc. You can reassure her it's not her and not to be discouraged at all. It would be a good idea to show her some links and information on performance anxiety.
On the upside, at least it's not the physiological kind of ED where you'll have to take a pill every time you're intimate