Re: The Jaimie Alexander/Lady Sif thread
There is no direct proof that they were "involved" in the past. However, there was nothing presented in the first film that indicated that they WEREN'T either. If reports about this movie are true, then it would appear that, at the very least, Sif is attracted to Thor. Also, I seem to recall a character profile mentioning that Sif wants to "rekindle" her relationship with Thor, but that could be inaccurate.