<human>: Can you succinctly summarize the text in 1-3 sentences?

My problem is basically that I'm dating my best friend, and I love him, but I don't know if I'm *in* love with him.

Some background: I and my best friend started dating about a year and a half ago. At first everything was great, fantastic. But about 6 months into the relationship his severe clinical depression reared it's head, and the next 10ish months were... bad. To put it lightly. I didn't seriously consider breaking up with him, but the depression put a huge strain on our relationship. It's not his fault, but he was constantly standing me up or arriving hours late (example: one time we were supposed to meet at his apartment at 10pm, when I got off work. I arrive, no one is there. Luckily his roommates left the back door open. He didn't contact me, or arrive until almost 2 am, whereupon he left to go for a short bike ride to work out. I understand that exercise helps depression, and that depression really can make it impossible to do some things, but things like that happened a lot and I felt really unimportant).

He then went away on an archaeological dig for 2 months (no cell service), which I kind of saw as a test drive break up. But since he's been back things have been really good! So what's the problem, right? 

I knew before we started dating that he had depression, though I didn't understand the extent of it. 

I don't know if I'm still in love with him. I'm afraid that the winter and spring of depression killed it. He's still my best friend, but the fire/need to be together has been almost completely extinguished.

I'm worried that either a) I'm overthinking it, that this loss of passion is simply the next stage in a relationship. We still work together really well, we communicate well (besides this issue), we have fun together, and we have really similar goals in life. or b) I'm hanging onto a dead relationship because I don't want to lose someone who's been my best friend for years.
<bot>: My bf's severe depression may have killed my love for him. He's my best friend, though, so do I wait it out and hope it gets better?