dating help, problems, advice?

Hi everyone, first post on here. So I have created an unhealthy situation for myself. Its been about a month since we have even talked so it doesn't feel like a big deal to me luckily anymore! So there is this girl I go to school with, she just turned 29 and i am 27. We are both in college. she lives out of town and needed a place to stay. We started talking a lot on the phone for a few weeks and then since there is an extra room in the house where i am i told her she could stay here with her friend (another girl). First night she stayed we went drinking and i almost had sex with her. i am still a virgin, was waiting till marriage, now i don't know. Really just want to have sex with someone I care about and not a one night stand. i am a sensitive guy, nice guy. i have not had a lot of girl friends or even dated a lot since high school. Dating is hard for me because i struggle with anxiety problems. So we hung out a lot over the next few weeks. Her friend seemed to have a problem with her hanging out with me for some reason. For example they both carpool together and one Friday she was going to ride all the way back to her house with her friend and then drive her car an 1.5 hours back to see me that night just to make her friend happy. I talked her out of doing this. So she invited me down to her house which is a few hours away. I stayed there for 2 nights, I thought we had fun. She backed off after that and she said she felt freaked out by me staying at her house. She said we could keep doing what we were doing but she didn’t want a boyfriend. I asked her if she wanted to just be friends and she said no. We hung out a few more times and then she stopped talking to me and became cold. Last time I saw her she didn’t even say hi. I know she doesn’t like confrontation. I tried talking to her about what was going on and she gives me nothing and doesn’t want to talk. She’s distant and uninterested. I find it troubling since I spent so much time talking to her on the phone, once 3 ½ hrs into the night. I felt close to her and then she doesn’t want to speak at all. And we never had a fight or anything. Then I found out yesterday she has a new boyfriend already? Why couldn’t she just tell me lets be friends and communicate like a normal person? Or am I the crazy person? It’s troubling since she still stays at my house a couple days a week. I just want us talk like we used to. I miss her. Can we no longer be friends? Should I give up on talking to her about what’s going on and pretend like her avoidance doesn’t bother me?