Maybe someone has gone through this before, and can advise me

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Maybe someone has gone through this before, and can advise me how to act.

TL;DR: same gender friend hitting on you. What to do/say?

>be me
>male
>have a girlfriend

4 am, a big friend, guy, of mine texts me, one night after we hung out with other friends on a bar "are you bi? I always knew, hottie. I found your haircut to tell so. I am, but I keep it silent hihihi". I kinda suspected he was, but I never cared to delve more into it.

So I answered, on the next day "No, bro, I'm not.. but don't worry, I won't tell anyone or anything. I'm sure you won't confuse our friendship with second intentions, right"
Which he replied "hahaha" minutes later.

On one hand I don't want to be very harsh on him, because I don't want him to think that him admitting to be bi means losing all friendships. And on the other hand, I don't want him to ever comment anything like that again, because it made me feel uncomfortable and I'd be forced to stop talking with him.

What do you guys think I should do? Leave it like it is, or send something else?

Feel free to comment how was your experience, if you had one.