You're allowed to hold this for as long as it serves you. Your husband responded to your legitimate feelings of hurt and betrayal by lying to you when he should have taken responsibility and made amends.
Even if he's not physically cheating, it's clear from your feelings and his response that this texting relationship crossed a boundary in your relationship.
He needs to address that and if he can't or won't, you can't move forward. If he won't talk to you directly, see if he'll go to couples counseling with you.
This isn't your problem to fix alone. In your one-on-one counseling sessions, focus on your feelings and identify the support you need to move forward.
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