Firstly, sorry if this post is TMI or inappropriate.
DP and I have been together for 2 years and have a 7 month old. We've always had a healthy sex drive, we have it almost every day, I'd have it more but I have a much higher sex drive 
DP has always been quite a selfish lover (no fore play and never gives oral etc but expects it for himself). He told me a few weeks back that he always feels really horny when he's feeling depressed and the last week he's just suddenly completely changed in bed, not only does he want it every second of the day but he's doing the foreplay and oral all the time and is overall much better in bed! Since being together he's never given me an orgasm but this week he's given me 2 already. I'm not complaining cos I'm really enjoying it but I'm a bit worried that he may be depressed after what he told me. Plus it's a bit strange that after 2 years he's suddenly changed how he does things...