Well just give him time to get over this.
You need to realize that you cannot get angry at him for no reason. You jumped to conclusions and you got angry when he didn't do anything wrong. It was obviously just because you are emotionally attached to him and his exes text message got you a little upset. Next time just wait it out, if he texts her then you have a reason to be angry... untill then just tell him that it upsets his ex is talking to him and that you don't want her to ruin what you guys have. Tell him your really sorry for jumping to conclusions and you will try not to do it again. Just let him no you really like him and that you are willing to deal with his ex just to be with him.
=] goodluckkk
