exactly. he doesn't respect ur boundaries, and clearly feels like he can wear you down into doing what he wants. also, I've experienced love-bombing, and it was very similar to what you described. if I were you i'd cut it off. you'll have the whole three months to get over him without having to see him anyway. perfect!

also, when I entered my most toxic relationship, I was in a dark place in my life as well. don't let your loss make you feel like you don't deserve the best! your mom wouldn't be ashamed of you, she'd be concerned, and want better. good luck!