I don't know what to do

So, I have this boyfriend and we've been together for years, but it's been a long time since we've gotten romantic. We're long distance, and he will barely talk to me on the phone for 2 minutes without screaming at me. I've managed to calm him down a bit, but he just won't be romantic or affectionate at all. I love him to death though and it kills me that he's being so distant.

The part where I get confused is with this girl. She's been my best friend on and off since the first day of high school. We're both graduated now. All throughout our friendship, we've argued because of my boyfriend, but now we've decided to just leave him out of our conversations so we can have our normal friendship. I was one of the first people she came out to when she did, and she's bi. She started dating this girl, but things didn't work out. They're still best friends and she really loves her. The distance between them is too much, though. For a while, she's been asking me if I like girls. I keep saying no, but she will say certain things to me and send me pictures (not nude pics, but seductive in a way) and start laughing when I freak out. I don't get mad, I just get bashful. It took months after we became friends again for me to tell her she's beautiful, and that was a huge deal. And then I blurted out "I love you" and she got all excited and I started crying when she said it back. We'll joke around and call each other "baby" and stuff, but I'm not sure how much of that is just joking. We can talk for hours and laugh about pretty much anything. I have a great time talking to her, and I almost forget about having a boyfriend.

I've never really had a best friend that I could be completely comfortable with before, so I don't know if this is just something best friends do or is there something more here? Obviously, I love her and I care about her, but the line is kind of hazy.

What is this?