What does it mean if your boyfriend starts being really nice all of a sudden? Am I just being defensive?

Yesterday my boyfriend started being really sweet to me. Before he left for work I was sitting around upset because I didn't feel good and i didn't think he noticed. He texted me when he got to work like he always does and asked me if "we were ok". I said yeah, we're the same as always. And he said he feels like im not happy anymore and talking about our relationship and when we get married (we've been together for over two years). And i asked him why he was asking me this stuff, because he normally never does unless i bring it up, and he says i just seemed really unhappy and it broke his heart. Thats something he never says, and i asked him why he was being different and he said he wasn't he just wanted to make sure i was happy.

The night before he went up to his best friends house because a friend they had went to college with was in town, so i asked if anything happened. He said no i just looked sad and he was worried and wanted to make sure everything was okay. And he said that he hates it when he starts showing he cares more and then i think something is up and he feels like i dont trust him. I told him i'm just not used to it. Because im not. Its not like he's a jerk or anything but he kind of struggles in the affection department. Like if he thinks something is wrong he'll ask or if i cry he'll hold me and tell me everythings okay. But he never really does anything sweet on his own.

But other than that, he's being acting like his regular happy go lucky self. So im just kinda confused.
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What does it mean if your boyfriend starts being really nice all of a sudden? Am I just being defensive?
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