How do you handle in-laws that hate you?

I have a uncle who has a girlfriend ten years older than i am. We used to talk and hang out alot when I moved in with them. We both got into some trouble with flirting long time ago and uncle was pissed. (2 years ago) We all apologized and made amends with each other. Everything was back to normal until I stopped contact with her and she kinda ignore me a little. I will text her and she only reply back with a short messages and sometimes fast. We cut all of the flirting long time ago but she still seems to flirt ( when my uncle is around she don't know me but when he is not around she chat and come around) I think she is bipolar maybe this is why she acts like this...idk. I asked her was she bipolar and she didnt answer. Today I found out she is pregnant by my uncle and I congratulate her and still no text. Does she hates me or what? If she does do you think i should completely ignore her like she don't exist???