I actually think that the problem is that some people think the words are 'tex', 'texing' and 'texed'. This is how certain friends of mine seem to be saying it, anyway. So they say 'I texed you this morning' when I would say 'I texted (text-ed) you this morning'. Strange as it may seem, but some people have got so sloppy with English grammar! I blame the schools......
Of course texted is pronounced text-ed. The same as shouted is pronounced shout-ed. Let's get English grammar taught properly again - even 'new' words like these should be written and pronounced correctly!!