So i have read a bunch of different advice columns and posts but i figured I'd try and get an opinion on my situation specifically.
I'm 20 years old and currently attend college. Last semester during my sophomore year I met this freshman girl at one of my fraternities party's. we were both pretty into each other and ended up making out in the basement that same night. Eventually it became a pretty consistent hookup (though we never really got passed making out). Flash forward two months, we start texting more frequently, and hanging out during the week. One night she decides to give me a handjob (I wanted sex or a blowjob..... but i was dumb and complacent). I didn't cum because i was drunk. Throughout this time I was acting a little too much like a "nice guy" too. The next weekend we end up hooking up in my frat house, but she tells me she doesn't want to go to my room (i didn't think much of this red flag at the time). The next week was my Fraternity formal which i had invited her too two weeks earlier. That whole weekend she was really cold to me and eventually told me that "I think we are over", this girl who was initially much more into me for months. I was really pissed off that she did this at my formal and was upset. I told her I had zero desire to be her friend at cut her off. A week later she texted me apologizing and wanted to meet. Unfortunately I took the bait in an attempt to win her back. She told me that hooking up to her meant "only making out" not sure if this is true. She said that things fell apat because she "got bored". I did learn from a friend that she "hooked up" with some guy in her dorm.... but whatever we never said we were exclusive. after this the conversation got hostile, I told her I was angry (at my own formal........) and had the desire to make her life miserable, but then backtracked almost instantly and apologized. after that i stopped speaking to her and she made no effort to contact me. The next time we saw each other we were cordial and nodded at each other at a party. The last week of school I saw her again at a club, she tried dancing with my best friend but he rejected her. her best friend was throwing herself at me but i suspect that it was only so my ex would have permission to go after my frat brothers. That night I ended up making out with a completely random but hot girl in front of her (not really subtlety). Then the school year ended
Over the summer break I have worked on improving my confidence with women. learned to move faster (I feel like if i just would have had sex with her from the start i wouldn't be in this position, in my defense i though she was a virgin for a really long time). I have been on a couple dates, and obviously am not opposed to trying to find someone new or just random hookups. I just really liked this one specifically, and maybe this is a mistake I have to make. I have broken the nice guy act, and built some muscle at the gym. I wasn't a bad looking dude before though, and my wardrobe has always been good.
When the school year starts she will be frequenting my fraternities parties. There will also be no shortage of other women present. Also in my arsenal is I am still close with her best friend and roommate. Obviously I plan to make a big confident entrance this semester. Beyond that, how should I act towards her specifically to reignite the attraction. let her make the first move? ignore her? be friendly? be cocky? Whats my next step?