Save the text messages. Print them out if you can. Even if you don't have a lot of money this is certainly a case where you want to consult with an attorney. Most attorneys will give you a free consultation. Speak with a couple, and then you can make a more informed decision.
Sounds like a crazy case! Unfortunately your boyfriend has got some serious charges as a Burglary with a Battery therein is a PBL (punishable by life ) crime. Be careful texting the victim as you do not want to get a tampering charge which is also a felony. Print out all the texts and screen shot them. Take them to a lawyer and get some help! Good luck!
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Your boyfriend needs to be very careful not to talk to the victim on the jail phones. The phones in the jails are recorded and he does not want a tampering charge. He could also be charged with tampering if the State suspects you are helping buy their testimony for him. These are very serious charges. Save the text messages. They may be good impeachment at trial or good for negotiating. If they are making accusations just to get money from him, he may have a good defense. Make sure his attorney has these texts and uses the wisely.