Okay, here is a (hopefully) quick recap of the season finale episode for Miss. Laura:
Theresa is pregnant. Marissa and everyone learn that it is a possiblity that it could be Ryan's kid. Ryan feels obligated. Theresa considers terminating her pregnancy. Kirsten talks to Theresa, lets her know she can tell her anything. Kirsten reveals something to the effect of 'wishing that she had someone to talk to...way back...So there is speculation that Kirsten has been in the same situation years before (probably with Jimmy Coopers kid)...Sandy knows nothing about this.
Theresa decides, after much deliberation that she will indeed keep the baby. She decides to move back to Cino.
Caleb and Julie say I do.
...As Theresa is leaving, Ryan decides to go with her.
Seth feels alone, because Ryan is gone, leaves Summer and his parents a dear john, and takes off on his sail boat.