Is this just too awkward to ask?

[RosettaMay]

Friend liked me for quite a while, I made excuses as wasn’t sure how I felt. Since then friend has gotten into opposite sex relationship (deliberately not stating our genders as I don’t want this to influence things). I want to ask whether they are bisexual or not but don’t want this to be weird!! Is it appropriate to ask? How can I?

Totally inappropriate.

Nothing to do with gender or orientation.
Everything to do with your friend is now in a relationship so the time for you to be wondering about their sexuality is past.

You made excuses when the friend was single, because you were not interested in them sexually.
It's now none of your business!

Well I guess if they're interested in relationships with people of the same sex (ie you) and with people of the opposite sex (ie the relationship they're in now) then they're bisexual. Why do you want to ask?

Why is it your business? I don’t understand

They liked your and nothing happened and now they’re with someone else?

If you’re the same sex and friend expressed sexual interest in you, and is now dating someone of the opposite sex, seems reasonable to assume friend is bisexual! Rude to ask Qs about sexuality unless someone brings it up IMO!

I with the other posters, you turned him down and it's absolutely none of your business who he/she sees now

Bi, pan, omni- what does it matter? They're in a relationship now so your window has closed, be happy for your friend and move on.

There's nothing to be gained from interrogating them now, if it's something your friend wants to discuss it's for them to disclose.

Why do you want to ask? You weren’t interested in them so why does it matter?