I need relationship advice, /adv/

I've been going out with my boyfriend for about two months now, before that he was my best friend. I don't think he actually cared all that MUCH for me but he's a nice guy so when I confessed, I guess he wanted to not hurt my feelings and..?

The thing is, everything was fine for a while. But now, eh, everything seems so forced. Every damn thing. And he's so cold with me nearly all the time, snappy and uninterested (at least for him, as I said he's a really nice guy so he doesn't show that much), but there's times when he's really sweet to me and I .. guess I begin to have hope.

I feel myself growing dependant on him, I wait for him to reply and get upset when he doesn't, I'm always happy to see him while I feel he isn't ever anymore.
I would have broken it off a long time ago, but every time I'm about to do it, he does something extremely nice. For example, take today. Apparently he took the afternoon off, according to our mutual mate, to greet me, called in sick (I just came from the airport), and so I naturally messaged him immediately when I got home, happy to see him but apparently now he's not even answering. Welp, I'd have ran to him for 20 kms to the airport if I hadn't seen him for a week but even though we live a stress across from each other and he knoowss I'm back, he does nothing.

I feel him being cold towards me, and I'm really miserable all the time these days.

At the same time, I kind of don't want to break it off because he's my best friend and I wouldn't want for things to get bad. I don't even know what I feel for him, I mean, I don't think I ever even loved him, it was just a temporary thing. But I feel safe being with him and I know it's really selfish but I know that a lot of people would go after him if I let go and I really couldn't bear watching that.

Sorry if this was a clusterfuck and hard to read, I'm rather upset right now, and any advice would be greatly appreciated. Thank you.