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I am sorry to hear about this situation.
Technically, he can try to take her to Court to get child support. Or rather, he can file to modify. In order to get a modification for child support (in this case, modification mean actually getting it ordered), he would have to prove:
1) That it is in the best interest of the child, and
2) There has been a substantial change in circumstance since the original order that makes his request warranted.
In other words, the Judge would want to see WHY he wants child support now and what has happened to chance the circumstances.
If he cannot prove a god reason, or worse yet if she can show by his emails or texts that the primary reason for his request is to get a co-signor, then the Court is much less likely to agree to his request.
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