I need some help with this girl I have really liked for 3 years!?

We had a little thing going on during or freshman year at college when we first met. She liked me I could tell. I was a slow mover though so before I went to step things up to another level I had to back off from her because another guy got closer to her and moved faster and they ended up together. Very hard and painful, but I knew it would be wrong for me to be there trying to get with her. This guy was a flasy type had money, dressed really nice, nice car etc. I decided I would go about my life,respect her, and come back to her later on when she‘s single.. During that time we kept in contact and I would say hi on the holidays she was always very happy to hear from me. Now we are juniors and they broke up a couple of months ago. Saw it coming as they didn’t have a great relationship. I felt great thinking that this would be my chance to finally get the girl of my dreams. The first time in a year I saw her and she stared intensely into my eyes for for a full hour and stood in front of me the hole time as we talked it was great..so I thought great now I’ll start getting back into her life and build something. Then 2 weeks later I saw new pictures of her and this new guy online they went on a trip together with this group I learned he had been trying to get with her since the break up.. My heart shattered. I didn’t know if they were together yet, but I feared the worse. This guy came out of nowhere.. seems to have all the goodies to offer her like the last guy. I sorta panicked after I saw the pictures and called her a couple of days later I said something I probably shouldn’t have said. Really was my gut talking and not my head. I told her on the phone that I missed her during the time we didn’t talk last year. She just went off in a loud voice telling me she has a bf and I need to understand that.. She said she can’t have 2 guys around because of what people will think and I need to move on. All i said was I missed her which was something I’ve said in the past, but without this reaction. Then on campus the next day as I was walking I saw him from a distance with his hand on her back walking with her to get lunch. She noticed me for a minute before she went inside. On facebook she’s listed as “single” and the same day I saw her she took pictures of the new guy down which was odd. On her other active profile she’s listed as “in a relationship” but that’s from her old bf and she never changed it and still keeps a picture of them there. I would think because they were together so long and I am certain she’s still not over him just like that. This new guy she probably likes but may just be using him to pick up where the other left off. I mean how can she get with someone just weeks after a break up..

Anyway, I know I need to move on.. as hurt as I am I will, but what I am asking here is if there could ever be a chance in the future? Obviously not now but in the future. We were always close, never together but that’s because I never was able to step things up because of these guys. She goes with flasy type of guys it seems.. I am good looking and a good guy but without all the flash.. we are young early 20’s. Maybe one day when she’s older and is single and emotionally unattached will she ever wonder hmm that guy who’s always liked me and was so great I wonder how he is.. and kinda open up to me and give me a chance? My friend says that when girls get older they change.