越来越：means: ’getting....‘ It's always followed by adj. or adv. and change them to comparative. Can't be followed by verb.
怎么：means: ’somehow‘ in statement sentences. 不怎么: somehow not..... Of course there is a 了at the end of her sentence means pass tense,so has comparative meaning. So the meaning is: you talk to me less( than before) somehow.
Eg: 他不怎么爱说话。( He doesn't like talking somehow----in general)
他不怎么爱说话了。( He doesn't like talking (as much as before) somehow)
他怎么这么爱说话。( Somehow he loves talking so much.)
In Chinese, special question pronouns have different functions in statement sentences, like 什么：我什么书都看。(I read all kinds of books) 谁：谁去都可以。( Everyone can go there.) 哪：他哪都不去。(He doesn't go anywhere.)..It's complicated, so try to avoid using these at beginning. Your sentence can change to: 你理我越来越少了。or 你和我联系越来越少了。（越来越+ adj.)