Help! I need an online background check done on my boyfriend?

Can someone please help me. I think the guy ive been dating for 5 months is lieing to me about who he is and im really worried. Ive been distancing myself from him and now he seems a little obsessed with me. I'd like to know if anyone can recommend any reasonably priced background checking sites or a private investigator? But here is my problem. Ive paid for and looked him up by cell phone number at lookupanyone.com as well as another telephone look up site and both results came back with his cell phone number under another womans name...also the womans cell phone references (i.e: other household members oc with that number) was one of the names he has mentioned before when we first started dating. I am very scared that this guy could be some sociopath and I feel extremely betrayed and lied to. An before some of you call me an idiot, ill explain a little more about the relationship. He is much older than me...im 25 and he is 45. When we first met, he was nice, respectful and charming, very clean, neat, smart and chivalrous. We shared a love of fine arts, politics, history and economics. He told me he was very wealthy but his car and clothing said otherwise which I didnt care about because I was more interested in him but now looking back on things his lifestyle doesnt add up to who he says he is. Also I understand that not all wealthy people specifically men care about wearing designer clothes or having the most expensive cars. Some are very frugal and I umed he was. He claims he has two businesses...one is helping retirees invest their retirement savings and the other is a financial adviser. I saw his business card but Ive never seen his office and I recently looked up his info on his business card online and another man with the same name and job title came up under a different picture. As I started asking him questions about some of these things he started acting as if I was being rude and invasive and he would quickly change the subject or want to leave and I know thats not a normal reaction unless your lieing about something. After our last conversation I had enough and I told him things are not working out and now he has been calling me 10 times a day. He left me a text msg saying "we will never be apart" and "what we have is very real and authentic". I am very trust worthy and obviously a naive person and I dont want to confront him out of fear that he may be a psycho and try and hurt me. So if the info from the background check, tells me hes crazy with a mile long rap sheet than I will get a restraining order but I dont want to spend alot of money and receive zero results. Also im not sure if his name is real or what he does is real.. the only two things I have are his cellphone number and license plate number. So please can someone recommend a great online investigating service so that I dont wind up on Nancy Grace!