After the unnecessary and nonsense argument Monica had with Deth she immediately left her friend's house out of annoyance.
She doesn’t know why she started arguing with him the moment she noticed the two of them are being close with each other and talking as if she wasn’t there.
Is she jealous? She doesn’t know of she really was jealous earlier. She just stormed out of there without saying anything after the argument.
Also, why would she be jealous of them? It’s not like she knew Deth for that long and she has emotional and romantic feeling towards him. She’s trying to act natural and normal earlier but she couldn’t help it and lashed out.
She felt her heart throb in pain because of that sight. That's why she lost it and lashed out which is very impulsive and aggressive of her to act
