Strange behavior by ex.. 

Well, my ex and I have been "dating" for eight months now. He has be good about helping around the house (I bought a repo last Dec.) and spending time with me when he can (he has a very demanding job (attorney)), and compliments me like crazy.  Last night he comments that his lease is up in Feb. and what were we going to do. He keeps telling me that if we were together we would save money (he is in debt, so am I but I am keeping up with it). To live together, we would have to get married again, there in lays the problem. I don't know if I want to marry him again or even be with him. For thanksgiving (he's canadian, thanksgiving is in Oct.) he didn't invited me to go because his daughter was home from college and I don't think he has been honest about our relatioship with is family. Twice he has promised to take me up to where his daughter goes to college and both times he cancel our plans...he went he just didn't take me. Yesterday we had plans for him to come for the weekend. While waiting for him to arrive my sister and brother-in-law stopped in, we see my ex pull up to the house and then drive away.  He did this for about five minutes and then my sister and her husband left so my ex would come to the house. Well they no sooner left and my best friend and her husband stopped, my ex continued to circle the house with out stopping.  So they leave so he will stop going in circles. When he pulled in the driveway I asked him what in the hell was he doing. He said well I didn't know who was there and I didn't want to interrupt you. I said we're a couple aren't we, you're part of my life aren't you? By doing what you just did you showed me you don't #1 trust me to not be with another man #2 don't see our relationship as a true relationship. This is one of the things that happened in our marriage, you never allowed me in as part of the family. When my stepdaughter graduated I went with my ex to the ceremony and saw his mom and two of his sisters. I was scared I hadn't seen me in 18 months and who knows what he told them about me and our marrriage, but I got up and walked to meet them, hugged my former mother in law and both of his sisters. Help my former mother in law to her seat.  The next day we went to the mall with my son and then stopped at my best friends house (the one who had stopped at my house) well her husband is learning guitar and my ex is very talented at playing the paino and guitar so he is helping him with a rif, when one of their daughter showed my ex what she has learned, as he father called off cords she would play them, well when they go to the g-string my ex elbows their daugther (11 years old) and goes he said g-string in the voice of the family guy. It was absolutley embarassing that along with the circling the house I am starting to worry about his mental state. I don't know what to think I am so confused. I love the good part of him, but this illogical side frightens me and turns me off to him. Add the couple of lies I have caught him in and I just don't know what to do. I don't want to hurt him, but do I want to be with someone who lies to me and behaves so childishly?  I know what your thinking, you married him in the first place, but he has chanced so much from the man I itially meet.  Well, just want to throw this out there and see what others think, plus just needed to get it off my chest.