What are some signs your boyfriend is losing interest in you?

Ok my boyfriend and I have been dating for 4 and a half months.He is the perfect boyfriend(Other than the fact that he rarely calls me,I do all the calling)and it has been like that since we met,we used to text a lot but since he has no cell phone working anymore we haven't been able to use text.We last saw each other on the 26th of December.He gave me a beautiful cross necklace fro Christmas and I gave him gifts too.He didn't get to stay long,maybe 5 hours at my place because his dad called and said to meet him outside my house because they had to go to his siters house 45 minutes away.He was pretty bummed about having to leave so soon and so was I.Now I called him Saturday,we talked about how our new years went,and I asked him to see what he had plans for that day,he said his dad and mom were at work and he was waiting for them to get off to see what their plans were.He said his dad has been keeping him busy since he got home from college,he said he was annoyed at the fact that his dad has to drag him everywhere he goes.I said ok well maybe we can see each oher later or something(YES I can be a bit clingy) he said he missed me and he loved me and I said it back,and we always kiss before we hang up,*Muah* But today he was on Facebook and I sent him a message saying "How was your day today? he answered right away saying "hey baby" and I answered 3 minutes later "How has your day been?" he said 6 minutes later "Good so far,just cooking lol" I answered right away "Whatcha cookin lol" he went on idle right at 10 minutes so I figur he was cooking.He popped back online and answered minutes later saying "I cooked some buttered noodles then fried small pieces of chicken then cooked those together with some tomato sauce and paste ." and I said 3 minutes later "Hehe nice,I love buttered noodles!"(I clearly was not thinking about how stupid that made me probably look) he went on "Idle exactly 10 minutes after he told me this and I figured ok maybe he is eating now.He comes back online 50 minutes later and I wait for him to respond to my last message and he never did.He stayed online for about 30 minutes then went on idle again then came back online and then went back to idle and then logged off.Was he just busy today?