Confused about break up with bf - advice?

To put it into context, I was with my boyfriend for about 5 months and things seemed to be going really well. We saw each other a lot, met each other's families and things were generally just really good. I went on holiday for a few days without him (it was booked before I got with him anyway) and I barely heard from him the whole time I was there. I put that down to him wanting to leave me alone while I was away and have some time to himself, although in the back of my mind I was worrying he just didn't care any more. Anyway, things seemed completely normal when I got back, we had a couple of arguments but only over stupid things that were easily resolved and we've been fine since then and had some really good days/evenings together. Yesterday I got a phone call while he was out telling me that we needed to talk, so I saw him later that evening and he said he didn't know what he wanted from our relationship or really from life in general. He told me he still cares about me and we have some really good times, he just didn't seem to feel much of a spark any more. I understand what he means but ultimately I think there is still a "spark" - it's just different to the one you get at the beginning of a relationship, I think that's inevitable. We both agreed that we wanted to stay friends but I'm just really upset at how out of the blue it seems, and I'm disappointed that he couldn't have told me before so that we could try and work on it. After I got home I spoke to him and he said he'd come and have a chat with me sometime this week, but I have no idea what he intends to say or anything. I just feel so confused and could do with a bit of advice atm :( for now I'm not going to contact him, I might do later in the week just to ask if he's going to come over at any time, but I'm going to try not to for now, despite how much I want to. Any advice would be really appreciated though :)

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