Stop being a nice guy. It makes chicks dump you. Go read no more Mr. Nice guy and The Rational Male.

That hurt to read. You need to read the sidebar.

Pointers

• Dont shit where you eat (dont date coworkers)
• Things were not "going well", as you had not had sex yet.
• Dont meet family or do any sort of relationshippy activities, until she has proven that she is worth it. I.e. sex should be good, green flags, good company, and only after all this is proven over time.
• Your game is weak, i.e. you were being too beta and she wasnt interested sexually. She liked your beta behaviours of quick commitment but didnt understand that it came with a price (not sexy).
• You have no abundance. Having one or two plates at all times will mitigate any strong feelings of disappointment.

Again, read the sidebar and apply yourself.

I've been seeing this girl from work for the last 3 months

What does "seeing" mean exactly? Dating? Fucking?

workplace

This is fucking terrible

We had booked a hotel for 3 nights the following week while she was busy with a school program. I only stayed the first night because she told me she was uncomfortable with me being there. I was very offended after everything we had done together, how could she not want me there?

This is odd if you are "seeing" her, we need more context.

She said she was worried about me having any expectations about being there. Meaning, she was nervous about having sex. Neither of us have our own places and had tried and failed many times to have sex in a car. So, we hadn't had sex yet.

So you are "seeing" each other, but not having sex...... so what have you been doing for 3 months? Kissing? Blowjobs? Or you paying for meals while she does what she can to avoid having sex with you?

After that week, she was just different. Wouldn't text me, wouldn't look at me or care to be around me at work. I said enough is enough and I confronted her.

Ok.,...

She told me she should've wanted me there at the hotel but she didn't so she realized she should end things with me. She told me I was never assertive enough, passionate enough, and that she wasn't physically attracted to me.

Ok...... this is fairly normal female behaviour. She's behaving like she wants to want you, but realises she doesn't want you when it comes down to it, therefore it's over.

This is fine and normal, but this should happen in a few dates, NOT AFTER THREE MONTHS.

I know it's wrong for me to still want to be with her after being disrespected like that, but...I still want her. Where do I go from here?

Forget her. You just want her because you like her and to protect your ego.

It's over. Forget it.

Find other women, be more dominant with them, and don't get attached before sex on two separate occasions.

Where do you go from here? Live the best life you can. You aren't going anywhere with her. When you see her at work, be polite but cool and distant.