As refika said, totally normal. It's frustrating, and sometimes upsetting -- but it's a normal thing that happens in therapy, and if you can tolerate it, it can be a VERY valuable tool for understanding how you relate to other people.

Certainly read up about transference, which is a general phenomenon but is especially intense with therapy... basically, "transferring" your feelings about other people who have made you feel a similar way onto a particular person. We do this all the time, but in therapy, since you know so little about T, this can be even stronger because you place your own ideas and feelings into the blanks. There are other reasons, too, but that's a crude summary of the theory.

And more broadly, it makes total sense to me that after feeling rejected by the people who ought to have been loving and nourishing toward you, of course you're going to develop really warm feelings toward someone who gives you those things you deserved but didn't get. And you wouldn't be the first person who fell in love, over time, with someone she wasn't attracted to to begin with! How we see other people changes so much with the way in which we know them. Sure, you don't love him in a classic give-and-take sense, but the feelings of attachment can still be there.

I know what you mean about the guilt. Not only is my T married, I am too. But you can't control your feelings, just how you respond to them. If you have a good T, this is a great way to explore those feelings, because a good T will not take advantage of you or use your vulnerability to gratify his own needs... you can talk and explore and know you're safe.

People experience many different kinds of transference, so it'll be interesting for you to ask yourself why yours is of a romantic nature. I'm still figuring it out myself, but it has helped me learn a lot about me and why I respond to certain situations the way I do.

Please keep posting; you're in good company here.