I'm going to go against the grain here and say that you shouldn't make decisions based on what random people on the internet say. By all means read all the replies but the best course of action is to seek professional counsel and guidance from an attorney.

You may or may not have to go through a legal battle to get your share.

You should document everything as soon as you can, text messages and emails. The more paper trails you have, the better. Don't agree to anything verbally or sign anything.

Finally, don't make hasty decisions on an impulse. It would be best to be cautious and consider all possibilities.