03 RSX bent valve?

After running fine i went to leave, it would crank about 20 seconds and go dead. Kept doing that for a while, had someone come look at it, started it up, it stayed going but sounded like crap. Sounded like it wasn't getting enough gas, spitting and sputtering so I cut it right back off. After that, the dealership I got it from come to get it to take to a shop and it wouldn't start at all. The shop said it jumped time, bent a valve and I needed a new motor. I'm a girl, know nothing about cars, just ordered an engine and now someone is telling me that it's probably not a bent valve. That 03 has chains, blah blah no way it broke or jumped time. I know no one here can probably give me a definitive answer but can someone tell me what most likely happened. Do I need to trust the one mechanic that looked at it and buy a new engine? He said he knew it had bent a valve by feeling/wiggling it. If it did bend a valve, is there a simpler way of fixing it? Any advice would be appreciated. It's a base model, automatic if that makes any difference. TIA

03 RSX bent valve?