Feelings for a mate

To cut a long story short got a good male mate who I'm falling for a second time. The first time was a few years ago and I told him at the time which he was fine with. I'm bi but he is str8 and engaged I don't know what to do with these new feelings. I've got over him before and moved on but recently these feelings have come back. I've not been able to think straight for about 2 weeks with it all etc. obviously nothing will happen as he is engaged. What can I do?

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