Ok, you are getting started to think logistically. This is good!

If prostitution is illegal in your state, then that message in which he made a solicitation being willing to pay might be in your favor to tip the scale (his soliciting paid sex vs your lax housekeeping standards). I can tell you that on the federal level, it IS a very significant wrongdoing, because one has to answer "have you ever solicited prostitution? " when applying for a US visa or US immigration benefits. On the state level - prostitution is illegal in most states. I don't think it should be, but the fact is that it is illegal in your area, most likely, so you can use that fact to level out the playing field, e.g. have something going in YOUR favor, since you haven't made illegal solicitation attempts.