How would I go about asking a partner about his past?

I'm in a long distance relationship and my boyfriend always wants to try "sexting" or have "phone sex." I'm just not comfortable doing so, and don't even know how. Any pointers?

My boyfriend kisses with his eyes open. I've heard you are not supposed to trust people who kiss with their eyes open. I naturally kiss with my eyes closed (except to peek occasionally to see if his eyes are open). What's up with kissing with your eyes open?! What does that mean?

My (ex?) best friend and I drifted apart a few months ago because of her new boyfriend and my busy schedule. Before, we were like sisters, but now we just ignore each other. She's recently been trying to contact me, and even though I do miss her more than anything, I haven't been answering her calls. I'm not sure if I want her back in my life. There were certain things about our friendship that didn't seem right. There were things we couldn't/wouldn't tell each other. She also liked to make me feel unimportant. I know this makes it seem like we never were true friends, but we meant everything to each other. I just don't know if I should let her back in or not? Please help?