I miss him and feel dumb about it

So my bf just broke up with me recently [over personal issues on his side]. He was a great guy and I loved talking to and being around him. I really liked him.

The thing is, we only dated about a month, though I feel like we connected really well. It's been a few days and I'm still miserable and miss him so much, but I feel like my level of heartbroken-ness is too much for just a month of dating. I miss talking to him and doing things with him, even just laying down together and watching tv.

I feel dumb for being this upset over a month, honestly. But I do, I'm miserable and just wish we could be back together...