I have been with me partner for 11 years and have 2 children but since the children I have caught her talking to other men on internet chat 4 times but its never gone past just the talk but dirty talk she says that she loves me and wants to be with me but why does she keep doing this

Sometimes woman want attential to make them feel pretty or good about themselves. Obviuosly what she's doing is very wrong and you need to make that clear. If she keeps on going behind your back maybe its time to move on for your children sake and yourself. But my advice would to make it clear that the crap needs to stop. Good look be strong

Have you asked her why she does this? What did she say? She would know.

I would ask her, only she knows.

I would assume that she is looking for attention or misses flirting, some people need that even though they may be faithful physically, but if this is not addressed, it could grow into that as well. I would recommend couple's counceling if she is not willing to open up to you on her own.