HELP how to support bf

C

So it’s finals week and tomorrow’s the last day. We hung out earlier and I thought everything was fine. He texts later in the middle of our convo about how it’s so hard to focus and I reply with how he’s got this and it’s all gonna be ok. Then he replies back with how I’m always saying dumb things like that and how he opens up to me (he’s had a rough month) but my support is lacking (sucks). What am I supposed to say back? I truly don’t mean anything bad by anything that I say but I’m not the best at emotional support since I often just close myself off... how do I fix this?