What's wrong with him?

I'm about ready to leave seriously!

I've been with my partner for 7 years now. Obviously we've had ups and downs but nothing major, but lately he's really bothering me. It's like he has 2 different personalities! He gets home from work and he's great, then just as quick he changes his mood and is different! Like if he can't find something he's looking for he makes a massive deal out of it, not accusing me directly of moving his stuff but aiming it that way. The most trivial things are all blown up and its exhausting me! We could be in mid conversation where we're both chatting away and everything is fine, then he'll suddenly stsrt losing interest in the conversation and will start being blunt so the conversation soon ends. It feels like as soon as any happiness shows, he matches it with his mood swings. I've had enough of living on fucking eggshells, he does suffer with anxiety but won't go and renew his meds because he thinks he's fine. I honestly think he either (a) wants us to split, or (b) he's got some other mental illness going on. It's bringing me down and making it hard for me to want to continue this relationship