Girlfriend told me she's been faking it in bed last four months, what do I do?

Anonymous
Long story short I've been trying to figure out what's been bothering her - she came out with it yesterday and said that I'm not as big as her ex was.

I put on the front and nodded whatever, wasn't really even sure what to say. She felt bad that she had lied for so long, which made me qeustion what she even meant - to which she elaborated that she really hadn't enjoyed any of the times I was inside her.

I really didn't know what to say. I mean, she wasn't mean about it, she was crying. The whole thing though well, hurts. She wanted me to say something, but I didn't know what to say. Just sat there trying to find words. She kept trying to get me to say something, started crying and ran out. She texted me a few times today, but I just don't know what to do or say. I mean, four months.. why, why couldn't she have just said anything sooner?

This is extremely devastating because her father already gave me his approval to marry her. He said I was her only boyfriend that treated her entire family with respect even if they undeserving, and it made him respect me. I know its only been four months, but the reception and everything was on the rise. This was without a doubt the best relationship I'd been in... apparently, aside from sex.

Guys: what can I do here? I'm at a really low place and need something. If you were me, what would you do?

Females: I don't even know what to ask you all. What would you tell me if you were my girlfriend?

Anyway -

I sort of feel like I've been lied to, well, actually i'm unsure in general. My past ex's used to say I was so huge, and would moan all the time. Now after hearing this, I wonder if everyones just been faking and lying to me this whole time?

This is one of the worst feelings I've ever felt. When you essentially have to question everything that ever once was.
Updates
+1 y
Well I was going to reply to her after I received advice here, but she came back to my house today even though I hadn't responded to her texts, and broke up with me.

I wasn't really sure what to ask first -why? was it because I didn't respond?

she just shook her head and cried, just saying "I just cant"

She just turned and ran even though I yelled I'd be willing to try she just drove off crying
Girlfriend told me she's been faking it in bed last four months, what do I do?
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