Stop Making Googley Eyes in Public

I often feel a surge of anger when I see dating couples who are about my age and have an urge to throw rocks at them.
But other times, I just start crying and I try to blink away my tears as I walk past them.

I don't really know what I am feeling, whether it's hurt or jealousy or what. I want what they have but I don't even have someone that I can legitimately want it with. I never even saw other couples when I was in love, now I see them everywhere.

Does that I feel such strong emotions towards dating couples mean that I am not over my ex?

As I was walking back to the my apartment, I was thinking about how I was about to go make dinner alone, then eat at the table alone, and I would probably eat alone if I went to the caf anyway because I don't really have a group to eat with whom I am comfortable around, nor do I know where anyone sits in the caf anymore. I end up eating alone most of the time I go to the caf now because I don't see anyone I know.
The only person I saw at lunch today was Leah, but she sitting with my ex and his new "interest" (he wants to date her and she wants to date him, but they don't want to make it official right now).

Andy told me yesterday that it's been too long and that I should just get over him. He thinks I need to talk to his girlfriend and make new friends to help me. I don't have any old friends here (not close ones) to compare with new ones, I told him.
I have Abigail, who I met this August really. She's the only girl I feel really comfortable and confident hanging out with, but I still find myself holding my breath until she says "yes, I can come." There's Leiza and Heather and Christie, but they are busy with school and almost always say no when it comes to hanging out.
Keturah is an RA and taking 18 hours and works, so whenever I ask her to do something, she is too busy; I never ask Hannah because I don't know if I could keep up a conversation with her. I can ask Irene sometimes, but I am not sure if I really click with her and I don't want to force something.

So that leaves me with Abigail, who is a senior and I just met.