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Professor overstepping personal boundaries?

I hope this is okay to post here. I’m a female grad student in a class with a male professor who is also on my thesis committee. This is my second class with this professor and he has always been extremely nice, professional, and encouraging. However, recently I’ve picked up on certain behaviors that give me some pause. 

A few weeks ago he began to text me on my cellphone on the weekends. I did not give him my number - he presumably got it from my email signature. He has kept it mostly school related but did call my cellphone and ended the conversation with random personal questions. He has also recently added me on Facebook. Additionally a male classmate and I had to have similar one-on-one meetings to discuss our final projects and I told the male classmate to expect to field lots of personal questions from this professor (since that was my experience in our meeting). My classmate came back saying that did not happen at all. However a female classmate of mine also experienced the same treatment as I did with lots of questions and compliments in the second half of the meeting that were off topic from the project. 

The attention does not feel sexual in anyway but does feel excessive and gender specific. Should I say something to someone in the hopes that it doesn’t progress or should I just stay observant and not make a big deal? Has anyone experienced this? 

I received another text from him today asking why I wasn’t at an on campus event I had registered for. It all seems fairly innocuous but I feel sensitive to it. 

UPDATE: Thank you all for your feedback, it’s very helpful. I am removing my cellphone from my email signature, I completely agree that if I don’t want people to contact me I shouldn’t provide it. I’ve had my cellphone on my email signature for years without issue so this is new territory. 

I also want to clarify that personal questions varied from, “Do you have siblings? What do your parents do?” to “How did you pay for your undergraduate degree?” to “Why are you wanting to live in that city after graduation, do you have family or a boyfriend there?” What made them more unnerving is that they came out of nowhere with no prompting. We would be talking about something related to work and then he would jump to asking me a fairly specific question about my personal life. When we talked on the phone he asked me if I was going to a music festival and if I knew how he could get tickets. It seemed more like a question for Google than for me. The conversation also had no urgency at all and I was going to see him in class the next day. Like I said, they are fairly innocuous but I do not have a strong personal relationship with him and this strikes me as a strange way to build one. I have had good friendships with colleagues and professionals before but this is not how I experienced forming those relationships. 

As for the small sample size, I understand that not a lot can be gleaned from the experience of three people. However, I can say that the other female independently arrived at a feeling of discomfort in her interactions with him as well. I would say the three of us are equally engaged and ambitious, so there’s no reason I can see that the professor would have to not offer the same treatment to my male classmate.
gpt
Document, document, document, but also be clear about boundaries you would like to have. If you don't want to get texts about academic stuff on the weekends, say that. You can frame it as "work-life balance" or whatever you want, but make it crystal clear.