I just cosigned for a truck for my boyfriend about 4 months ago. I'm now regretting doing so since he is not the most responsible person with his money. Is there any way that I can get out of being responsible for him if he doesn't make a payment, or have someone replace me as the cosigner?

If your boyfriend will get a new loan to pay off the current one, you can be released, but no they have no reason to let you off, they knew he was a bad risk, that is why they needed you to co sign in the first place.

If he does not pay you will have to.

If your boyfriend is also keeping his other obligations current then his credit score should be improving as a result of this loan. If this is the case there is a possibility that he may be able to refinance the loan after 6 months to a year of positive payment history. This will be the only way you will be able to get out of it. This or if he sells it completely.