Bakit gusto mo siya ba?  mo ba siya gusto?

Ahh, "Bakit? Bakit gusto mo siya ba mo ba siya gusto??".
Hindi ko alam,
siguro dahil mahal ko siya?
Hindi bakit ganap ko alam. ko talaga alam bakit : /
[ paumanhin kung ang aking ng tagalog ay masama hindi maayos. ]

The English translation would be quite helpful. I just translated it this way based on the punctuation you used. This is how I read it in English.

Why do you like him/her?

Ahh, "Why? Why do you like him/her??"

I don't know, maybe because I love him/her?

I don't really know why. (Although I was thinking that you may have also meant "I don't completely know why" in which case would be translated as "Hindi ko lubos na alam kung bakit."

Bad Tagalog skills can be described as "masama" although it's super rare for someone to say this I think because masama is usually like evil or terrible in our context and we use it more often to describe other things.

You'd be better off saying "Hindi maayos" (not ok), "pangit" (ugly/bad), or "medyo alanganin" / "hindi kagalingan" (not too good).

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Some kind of Introduction

Do you want to laugh? I started to write my first notebook entry and almost finished it (!), but the battery of my phone died... 
Well, let's start again. I am Darya and now I want to make an introduction. Though, I haven't been practicing English for quite a long time, but I will try to do my best. (No need to say but because you already started with "Though")
So, as I said earlier my name is Darya (Dasha for short (if it's actually a short version; it has the same number of letters)) and it is believed to be connected with the name of the Persian King - Darius. I find it quite funny for a Russian name. 
So, I am currently going to high school and soon the most dreadful thing in my life will come... the Unified State Exam. But for now I don't want to think about it much (and about how badly it will affect my nervous system). 
Fortunately, I am on holiday now, so I should be able to relax and just watch my lovely TV series, but instead, I try to spend my free time learning Japanese! (well, of course not all of my free time). Because during the previous school year I was mostly improving my English. (Previous is needed to make your sentence consistent that you were mostly improving your English.) Plus, Japanese isn't taught at our school. I live in the European part of the country, so there is not much need for it (I wonder if people in Vladivostok learn Japanese at schools...). We have English as a main foreign language and we are also allowed to choose between German and French (it's the second foreign language (By the way, I chose German :3 ). Well, I'm not actually complaining about it, because if we even have Japanese to choose, I don't think that many people would be eager to choose it. It is considered to be one of the most difficult languages and all that stuff. 
Anyway, it is taught at the Institutes, so I was planning to wait until ('til)that time. However, I just didn't have enough patience, so I now started to learn it little by little. I am happy about it, because it's the language that I love the most.  (I broke down the sentences to separate the ideas better. It's better to separate multiple ideas rather than to have run-on sentences.)

Well, it turned out to be quite a long entry so I think that I will stop for now. 
Thanks for your attention.