Is he sleeping with someone else?

So I have been dating this guy for 4 and a half months, we instantly connected and have a great time together. He has really been burned by his past 2 relationships so he says he wants to take this slow and be patient with me. I am ready for that next commitment, he says he is not. I have met his friends and family and his daughter and he has me stay at his house and watch his dog while he is out of town. But lately he has been acting strange. Not wanting to see me because he is too tired, omitting the truth by simply not telling me he is going out, lying about being home while he is still out, Facebook messaging a girl with some suggestive comments about "probably's" and her gold pants, he will tell me he is busy but be on Facebook. I'm just really confused and since we aren't "together" I have no room to be upset. He says he isn't sleeping with anyone else, but some behavior suggests otherwise. Is he just keeping me around without a commitment so he can have his cake and eat it too?
Is he sleeping with someone else?
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