<human>: So a bit of background : me (23/f) and my boyfriend (22/m) have been together for 2.5 years, and living together for 1.5 years. I would like to state that I love him with all my heart, I really do. For around 6 months I've begun to feel myself drift out of our relationship. It's got to the point where I seemingly have no affection for him, I just don't want to kiss or hug him, or hold hands like we used to. Spending time with him usually leaves me irritated. 

Now I know you're reading this and thinking 'break up with him already!' Ive been struggling to come to terms with it but over the last few days I have finally managed to wrap my head around the fact that I am pretty much done with this relationship and that stringing him along further will do us no favours. This is where the issues are. 

My SO has been suffering from depression. Luckily his medication has been working, but I really fear that breaking up with him could cause him to relapse (not the right phrase I know, but I wasnt sure how to phrase it). He has told me repeatedly that without me he would have nothing to live for, that I'm the best thing that has ever happened to him. I know that leaving him would completely break him. The very thought of me leaving him has caused him to take panic attacks. (The most recent one was just a few days ago).

This week I am going away for a night catch up with friends, and I'll be using that night to think things through but chance are I'll be breaking up with him when I return. What's the best way to go about this? I want to make it as painless as can be all things considered. I really fear for his wellbeing even though I know its for the best. Any advice?

Can you condense the text into three sentences or less?
<bot>: I think I'm done with my relationship, but I'm scared for my boyfriend's mental health if we break up. Help?