<human>: So I met this girl about 8 months ago and we immediately hit it off. We had so much in common and had a good time getting to know each other. We've been official for 6 months now and it just seems different than what it used to be.

Lately, I would say In the last month, she's been acting more detached than she's ever been. When we first started dating she used to do little cute things liketake random pictures of me, call me to tell me she loves me, and show up at my house unexpected to do something, which I loved. Now she won't text me if I don't text her first and I basically have to force to come to my house to hang out. (Its worth noting she lives about 10 minutes away from me and you have to take the freeway.) 

I brought this up to her and she didn't have an explanation, but she insists she still loves me even if she doesn't say it as much. When i used to tell her i love her reaction would always be so compassionate and now when i tell her she replies with a monotonous "I love you too." 

I've never been in a real relationship like this so I guess you could say I'm new at this. My question is do relationships usually have a puppy dog love phase during the beginning that sort of dies down after the relationship gets older? Or does it seem like she's drifting apart, which I admittedly think is the case. I still love this girl and i want this relationship to work out. Has anyone else had a similar experience and if so, how did it turn out? Any advice is greatly appreciated.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Our relationship is 6 months old and she seems more detached and less affectionate. Is this normal as the relationship goes on or am I losing her?