Sexuality is a complicated thing and it's generally not black in white or set in stone by certain time. I'm bisexual and it took me a long time to come to terms with that.
I knew I was attracted to girls by late middle school/early high school but I pushed it aside as a "phase" and that being physically attracted to a girl wasn't the same as having feelings for them. Until I actually fell in love with a woman, which made it pointless to call it a phase anymore
It might take some time for you to figure out where you stand. I would advise you not to rush into a certain thought process. I've known people who believe they are gay but when they are with someone of the same sex, they aren't happy and they don't feel that attraction once in the relationship. I've also known people who say they are physically attracted to the same sex but have no desire to pursue them in any way.
So it's complicated. Allow yourself some time you figure out your feelings. In the end, if you say "You know what? I'm bisexual." That's great. But if still aren't sure or decide you're not or you just feel close to this woman in a platonic way, that's fine too. It can be easy to get lost in emotions, especially during a breakup, and your feelings are up and down.
But that doesn't mean your feelings aren't valid. Being a human is complicated so don't force yourself in one direction or another. Just give yourself time and I promise you'll figure it out.
That being said, feel free to message me along the way! I know it can be a struggle