Keep those expectations to zero or close to zero. It could be the time of the year and she's feeling like wanting to be close to you and the family at this time of the year. It could be the conversation she had w/your mother...there's no telling what is going on w/her.
I word of caution...be smart about the sex issue. Use protection because you just never know who she's actually been with. They don't think like adults, but more like teenagers and many of them end up contracting the gift that keeps on giving. Some say that they aren't haven't sex and then the spouse ends up w/something that they didn't have previously.
Stay strong, stay positive and continue to focus on you!
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.