Why will my baby mama not let me see our son?

I have court mandated visitation 3x per month and my baby mama will let me see our child then. The thing is, she will not every let me see him other than that. So for example she will not let me see him this fathers day. Also, she called me a couple weeks ago to say she was going on vacation for a week. I asked her if she would let me have our son for the week she was gone. She said absolutely not and that she didn't trust me and wanted to limit my time with him so he doesn't become like me. Thing is, our breakup was bad, we just did not get along but I don't have any kind of a record, have my own job, car, house, don't drink or smoke and pay my child support on time. She told me she's having someone else watch our child while she's gone, I just don't understand why she won't let me have more time?
Why will my baby mama not let me see our son?
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