Is my boyfriend acting suspicious?

So my boyfriend who I've been with for over a year has been different towards me the past few weeks, he tells me that a game is more important to him than me, recently he has started liking other girls pictures which he has never done before in the relationship so why is he starting now? If we have an argument he just goes out with his friends his not bothered about coming round and sorting it out. I always feel like a second option to him. Whenever I ask to use his phone he watches over my shoulder at what I'm doing. He doesn't do the little things he use to. Also soon we are going on holiday, he says to me we can't go out for a new or anything because we need to save for our holiday yet his out clubbing most weekends with his friends? Is this just me being a pyscho or is he being suspicious?