Is it normal for my boyfriend to spend the night with his baby momma once a week? She is remarried and her husband and my boyfriend are good friends. He says he spends the night there to spend time with his kids. He has his own house and I feel that if he wants to spend time with the kids, they should come to his house. He is extremely close to his baby momma and her husband, he has even moved in with them when he was evicted from his apartment. They have offered for him to live with them permanently. Does this seem strange or am I just filled with jealousy?