Ever suspect your ex of cheating but could never prove it?

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My son's mother and I were together for only a year and a half. I decided to end the relationship when I suspected her of cheating. I found 2 receipts in the headboard (why she put them there is beyond me) that had the last 4 digits of a credit that was not ours. Or atleast I didnt know it was ours until the phone call I made to her at work later. But back to the receipts one was from Wal-Mart with a total of more than 80 bucks worth of stuff that wasn't in our apartment...the other was a gas receipt, but I owned the only vehicle we had and she didn't drive. When I called her to confront her she denied it then eventually claims she took out the extra credit card in order to pay for a cell phone bill she had rang up, but neglected to tell me about that as well. We already had a credit card that I knew about that had exceeded it limit and we were barely able to make the payments to keep the balance dropping. I was furious and demanded she get out. Today my son lives with me and she barely ever comes around. Anytime I have confronted her about it she stills denies it.