<human>: I'm getting into a relationship that I never really thought would happen. I'm a guy and I've known this girl since high school. We were in the same graduating class, and we worked at the same place after high school. We even went to the same college and had a few classes together. We had been friends through all of this but she had an on/off boyfriend the whole time, and i had been in a semi-serious relationship for 3 years. Anyway she joined the military and was gone for 6 or so months and her and said boyfriend break up for real. 

During this break up we get a lot closer and start kind of getting closer sexually too. At this point for me she was just that friend I always had, but I felt like it was becoming more. Then, brace for it, she gets back with her ex and ends up getting pregnant. So they try to work it out for the sake of the baby. But like a thousand times before, they broke up. Now we are getting close like we were before.

What I need advice on is if I should continue to further my relationship with her and how? I mean I do like her and care about her. But idk how we could possibly have anything real with her having another guys kid. I don't want to get invested with her, and then end up getting hurt by her going back to the baby daddy. I don't know what to do. Help me please.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Girl next door and I are finally both single and talking again, but she is pregnant and I'm scared about getting hurt.