<human>: Our relationship has been rocky from the beginning, it seems. He was unsure about dating me, but later changed his mind. He didn't want to put a "label" on it, then insisted on us being "boyfriend/girlfriend" later. 

A few months ago I told him that I loved him, which didn't seem rushed to me since we have known each other for quite some time and dated casually even before becoming exclusive. He didn't return it, which hurt at first but he assured me he just needed a little time. He made it sound like a matter of weeks, not months. I also made it very, very clear that saying "I love you" was important to me in a relationship and that after a certain period of time without reciprocation, I would move on with my life. 

He is very physically affectionate with me and seems interested in talking about the future (I never bring it up! he does), but always insists for me to not go out of my way to see him or do nice things for him. It's like he rejects my love, or it feels that way. I once said during after-sex cuddles that I didn't want him to leave me because I saw myself with him for a long time, and he said "well there's no point in speculating about the future, it could happen [him leaving me and dumping me]." Then a week later he's saying he'd love to get a dog with me and an apartment in the near-ish future.

I'm really confused. He obviously doesn't love me, but he claims that he feels strongly for me. This is still great, but it seems to come and go without warning. I am having trouble figuring out if he's just going through a rough spot in his 20s where he is stressing about his unsure career future, school, work, etc. or if it's just that he's not very into me.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Boyfriend's affection and commitment comes and goes; is it just because he doesn't see himself with me or is this a common problem with relationships in your 20s?