i am a newbie in BTC & i brought almost 500$ btc from a local vendor

https://blockchain.info/tx/eccbfad225cbe99cb0f4c1abb94ccaf06a768988962812d4408921f8da40c6cf

but its been 2 days & i didnt received them in my wallet
i tried to contact him he says it sometimes takes 3 days

should i trust him or i just lost my money ?
is there any way to make this transaction fast ?
why transaction is not confirmed yet ?
also from last few days the price of BTC is not increasing much
it is changing in an range, but before this week it was increasing very rapidly why is so ?