First, your son is most important. I have 11 yr old and a 35 yr old sons. She may have had either, a concern about your relationship and exposing him to this lifestyle, or it could be hormonal. I am a man, but when a woman becomes pregnant, parenting and other natural instincts take over. She may not even realize what has happened. Maybe, even a social stigma, she thinks her son will face; and trust me, he will, and it scares her. I am not gay, my brother was and died of aids when it was new and, at that time, it was a very quick and sure death sentence. Still, love is hard. Talk to her about these things. Is it fears for her son, or a loss of affection towards you? Above all, Communicate And maybe like her, put him and his future treatment in mind, because he has two mothers, first. Gay lifestyle is still not popular, still. I lost my closest friend and brother to it. I still know it is genetic makeup and not a choice issue, but! I hope the best to you.