You stated "when the truth came out I thought my mom would take care of me and tell me everything's going to be ok"
Yes, that would have been a nice thing for her to do. Talk to your mom privately and tell her that you understand that she has felt powerless about what your dad was doing and that you do understand that reporting him could mean the loss of her income (child support etc).
... and tell her that what really bothers you is that you thought she would try to make you feel, as you said, that things would be ok ... and that she loves you and cares if you hurt from the thoughts about it.
What you are saying is that you are missing your mom's love. ........ tell her that.
Without saying it in your post ... it sounds like your dad molested you too. If so, how that affects you is up to you the individual. Some kids are horribly scarred from it. And honestly, others are not affected very badly at all. Importantly, do not let other people tell you how you should feel ... or that you should be in counseling or that you are damaged etc. If *YOU* feel that you need counseling then THAT is a reason to get it.
And only YOU know what the status of your relationship with your dad is. And if you are ok with where you two are at ... then you ARE OK.
Our parents are our parents; problems and all. Eventually we have to accept that they are sometimes horribly flawed people.
What you seem to be saying here is that, particularly because there is another love-interest coming into your mom's life (her new bf) ... that you are doubting her love for you ... and that her not consoling you about the issue with your dad is further evidence of this (evidence that she does not love you) ... tell her this is how you feel ... and that she made it even worse by telling you that you can leave if you don't like the new bf.
You love her ... and you want her to love you too. Tell her that.
One other problem:
Understand too that if it can be proved that she knew about what was going on and that she did nothing to protect you and your sisters, your mom could lose custody of you (for not having protected you) and that could put you in the position of having to find another family member to stay with and act as guardian for the next couple years. A whole rat's nest of problems.
I'm sorry things worked out they way they did ... and that you are stuck between a rock and a hard place as far as your own psychological well-being and your mom's income and the other legal risks associated with reporting what has happened. There is no good solution ... and the consequences of all of this are rotten and complicated.