Honestly I did feel today Tejasvi purposely asking him abt Vishal or purposely using their night time to talk to Nishant ignoring him to make him look like an insecure fool.
At tht point too to Karan it clearly looked like she got Vishal purposely n her gestures of not letting him touch her face added to his belief tht she wanted to make him jealous and others like Neha taunted him abt it too. In upset state we don't say the best of words so yea he must have said abt not asking Umar as in his mind she already knew wht she was doing. We saw on camera what happened inside n what she actually did but to him sitting outside he felt what he saw.
Haven't seen yesterday's episode, so don't know what happened. But day beforehand yesterday's episode itself, clearly teja wasn't amused by his behaviour and even told him so. It's natural to feel possessive and also liking your partner to be possessive about you too, but it's a fine line between possessive and over possessive. So maybe it was Teja's way of saying that he can't dictate. But will post my POV after watching the episode.