She wanted space. Now she's dating someone else. What do I do?

[Josh]

What should I do? We're an on/off relationship couple. We've been together for over a year, before she wanted a break. After no contact for 3 weeks, she came back to me. We were together again until two weeks ago, when she sent me these messages:

"No I need to say this. Mostly, I'm scared. Scared of the future. I know I've always told you I was going to run away with you. But the past couple days I've had to face reality. I have so many dreams I want to accomplish. I want to go to college and get a phd and be a doctor and I can't do that if I'm constantly worrying. I've always been the type of person to put everyone else first but I need to take care of myself first
This distance, and the empty ness I'm feeling recently is seriously hurting me...my grades have dropped, and Elon isn't going to consider me for the psych program anymore because of it. I haven't been sleeping or eating. I know I'm rambling but...what I'm trying to say is right now, I need to be taking care of myself so I can do what I want in life. Does that make sense?"

Now, after two weeks of no contact, I saw through Facebook that she's dating the SAME guy she was with when we broke up back in August for the first time. I love this girl more than anything. I feel like for now, though, the best thing for me to do is just move on, and I guess if it's meant to be she'll come back like she did last time. I've unfollowed her on all social media, and the guy she's dating is a sort of loser.

[Dayna]

The only reason she comes back is because they had a fight, once things get worked out she goes back to him, open you're eyes, she doesn't want a real relationship with you. you love her but she doesn't love you, move on and don't take her back, as long as you take her back she will keep using you, there is someone out there for you that will love you and treat you with respect, quit being a doormat