Have anyone met someone online and feel in love with them while still married?

Yes, that happens! What happened to you is not unusual as it happened to some people i know. In this world of technologies, and the rate of computer user is fastly growing. There are the different messengers used, people meet strangers through these messengers, exchange views, come to more each other deeply, til they fall in love with each other because of the fun they share. What's important is that you are able to hold your emotions and be responsible for every reaction. Be mature enough to handle the situation.