Am I in the wrong? New Landlord that hired property management

[John George]

Hi everybody, I am from Texas. I started a 2 year Rental agreement last year. I verbally told the tenant if he keeps up with his payments I will reconsider his rent (rookie mistake) and offer a discount for the 2nd year. I did, I would take $50 off his rent if he was willing to get renter's insurance (another huge mistake I didn't put in the contract). By the way, he is supposed to give property management proof this month or else it will go back to the normal rate in the contract.

The tenant has almost never paid on time, he paid his dues, but past the grace period. I never charged his late fees. There was a leak on the garage ceiling last year. Small pieces of Wet plaster fell on top of his car and we got the builder to fix it. He made a fuss but it was eventually sorted out. I realized eventually what a big mistake I made dealing with the tenant myself. I sub contracted property management recently. He wouldn't talk to the property management lady and tried contacting me. My property manager told me not to reply. He send an email saying how I promised a discount and $50 off is a slap to the face...so on and so forth. I just wanted to give a summary of the hole I dug myself in, but thankfully due to property management I was able to get help. Also he continuously complained about things like the toilet roll holder broke, and left a hole on the wall. Isn't that the tenants fault? 

Keep in mind that I am not a full time Landlord, I am in the Army, Active Duty and in school. My schedule is extremely busy, but I always did my part to make sure any maintenance was punctual. 

I just wanted to get a second opinion on this situation. I don't have to talk to the Tenant anymore since property management counts as the landlord right? Any advice, criticism, or comments? Let me know. Just trying to learn and get better at this.