Khloé Kardashian clearly doesn’t hold grudges! Despite ex and baby daddy Tristan Thompson’s multiple infidelities, the reality star made a few social media posts in his honor as he turned 33 on Wednesday, March 13. “Happy birthday @realtristan13,” the mom-of-two, 39, captioned an Instagram Story upload, which showed the athlete opening a gift alongside their daughter, True, 5, while their son, Tatum, who turns 2 in July, was sitting on the basketball player’s lap. It’s unclear if the image was new or a throwback. The Good American co-founder also shared a picture of Tristan with his younger br…