Our expert says:
Having been friends for so long, surely they DO like each other ( you don't mention whether You like Her )- but that's what friends do. This doesn't mean there's automatically anyhing to do with love or sex involved. That goes way beyond "liking".
Also, I assume that all along you and he tended to get together during the weekends - it doesn't sound as though you are seeing less of him, just that, because of their working together, she may see more of him. Why not just calmly discuss this with him, saying that you feel a bit uneasy, and see what he thinks and says ?
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