Why do men get complacent?

malty
Me (extrovert) and my (introvert) boyfriend are both 24 years old, been together for over a year. He studies PHD so he is very busy; we see each other 1-2 times a week. He doesn't make an effort to ask about me, and conversations are usually one sided. It usually depends on his mood, when he had a stressful day he becomes very quiet and withdrawn. I feel like I'm the sole communicator and/or affectionate one in this relationship- I send him cute texts and tell him that I love him and miss him first. He went overseas with his buddies and did not even bother to call me or even ask about me- we had a big fight because of that; I wanted to break up with him twice because of his lack of physical and emotional affection. I asked him if he loved me and/or was committed and he said " :o What do you mean? Of course I am!!". After our big fight our relationship grew better, he was so sweet and caring towards me. But now it's back to square one, I feel neglected again. It wasn't like that from the start; I see other couples and they both make an equal effort to nurture the relationship. My sisters boyfriend wants to spend every moment he can with her. My guy on the other hand is into independence; doesn't like texting or calling much, likes his space. He claims to be a lone wolf but he likes to hang out with his buddies.
One thing I really don't get is that; if you are truly in love with someone and invested in them, won't you crave to see them? don't you want to check in on them often? See how they are doing?
Throughout our relationship I have felt like he is checked out, sometimes he is distant but other times it is really good. He was told in his previous relationship that he doesn't know how to love someone properly. I'm thinking that he isn't going to change and I should just pack up and go...
I would like to know your opinions on this.
Why do men get complacent?
6 Opinion