Validity of nikaah if a couple don't have relations
Q:
1. Is the nikah of a couple still valid when the couple, though staying under one roof, have no relations and no mutual closeness for almost 2 years?
2. How shall she proceed to have the talaaq?
3. Same woman, currently is pregnant from another man. They both want to make nikah. Please advise the best way to resolve this situation.