<human>: My bf (28m) and I (23f) have been together for 6 months now. I would consider our relationship to be "good"--we get along most of the time, we have a lot of the same interests, we have great physical chemistry, and we laugh a lot. However, our relationship has been exactly the same since the day we met; I don't feel it getting any more serious on his end. We only see each other 2-3 days a week (this hasn't increased or decreased), we talk twice a day on the phone (this hasn't increased or decreased), and we haven't said the "L" word. He is generally a very non-affectionate person, but we do hold hands everywhere we go. Basically, I just feel like we're in a stalemate, I feel like he is keeping me at arm's length and that hasn't changed at all. We didn't have the "honeymoon" phase where we were over-the-top mushy around each other in the beginning, and we still haven't. I feel this has a lot to do with him being cheated on in his last relationship, and therefore he doesn't want to give me the ability to hurt him like she did. (This was years ago, and yes, I am his first official gf since then. He dated other girls but never for more than a month.) His friends all state that he is really into me and likes being with me, but it's hard for me to feel that way when things haven't strengthened at all over the course of 6 months.

Can you summarize the given text in a few sentences?
<bot>: I am in a relationship that hasn't evolved, for better or for worse, in 6 months. I feel he is keeping me at a distance.