Me And My Neighbor Having Affair

Actually years before a family only husband and wife came to my neighborhood they both are married for 3 years but they don't have children for 3 years so his wife and I had affair for past 1 year suddenly she got pregnant and his husband found we ve were in relationship and that child is the one born because of our affair so now his husband threatening her to divorce and she is threatening me to marry her we just had affair for fun I ve told things clearly before even every thing but now she is threatening me what I can do