Is it normal to feel like this
So I recently just found out that my Friend likes me ex. Well to be honest I still kinda liked her too(btw it was my first love). So he was thinking of confessing his feelings to her in which he did. It turns out that she liked him to and now they are going out. After hereing this my heart stopped for a second and then quickend up a bit and now I feel disgusted, and theirs a weird feeling in my stomach. What am I feeling? Is this jealosy and is it normal. And any advice on how to forget her?