I am a 51 year old man and have been seeing a woman who is 61 years old .Something is going on and I dont know?

what. we have been seing each other at least 2 days a week by me going over to her house. We have great conversation and great sex . She always ask me to come over when I am scheduled to be off work.Now a couple of weeks ago she didn,t want me to come over on a Friday night saying she had some cleaning up around the house to do(I have seen the place look like a pig sty)but to come over tommorow.Well i did and stayed a couple of days and then last week she called me asking my schedule to work and i told her I was off Saturday and Sunday (this was Saturday at 1 Pm. She didn,t ask me over and I didn,t invite myself.I called her later about 6 in the afternoon and we talked some but she still didn,t ask me over.Next day she calls about 9 in the morning (she never does that) and says it has just dawned on her that we dont have very much time to spend together so to call her.I call her and ask her whats going on and she says she just forgot. Now what is bothering me is i called this a crock and she says its not and calls me the next day saying that she cant see me because i dont trust her.I may need to add that the first week she went to a friend of hers wedding and called me to tell me that they had asked her out to a club to celebrate and she said she told them that she didn,t want to go. i told her I would come over and take her there if she wanted to but she said she didn,t want to go that she had some cleaning up around the house to do.So I get there the next day and I see her yard has been mowed by a man(Henry ) who she says is married and just wants to help her around the house. I have been suspicious of this guy since I first was told about him helping around the house. I asked her how many times he has hit on her and she says that he is just a friend and has never come on to her in any form or fashion which i know is a crock because there arent many if any guys that will mow a womans lawn for nothing and never even casually wink at them or something.She says he has never done this . Now here is the kicker she tells me that her dog bit Henry on the leg ! I casually sya well good dog and she says she thought I would feel that way.So she knows I dont like him being over there and apparently tyhought it was a little funny .I dont what is going on but i really believe something is going on because of the change in the way she is asking me over or in this case not asking me and she is asking me to believe some pretty outlandish things such as this man has never hit on her at all and in fact that no one ver hits on her where both she and I work(at the same casino where I am a table games dealer and she is a cocktail waitress)Now i am certainly no don juan and she is like me not a spring chicken BUT In a casino where alchohol is served I cant believe no one hits on her ever !AND telling me after 3 and a half years that she didn,t want to see me that she had some cleaning up to do when she has never said that before, and telling me the next week that she didnt realize that we has so little time to spend together when I just told her I was off that day ? She has never done that either.Oh I forgot to mention that while i was ther Henry called at 9.00 at night to tell her supposedly that where her dod bit him was swollen. Now what buisness does a Married man have calling a single woman (who supposedly wants nothing to do with him ) at that time of night to tell her his leg is swollen ? I told her I didn,t believe that and to please qiut lying to me and tell me the truth and she says she is but this isn,t my first rodeo as they say and really want to believe her but i really dont. I have been extreemly upset as i really thought we were friends and lovers and we both tell each other all the time that we love each other. Now I live 45 minutes from her aND OBVIOUSLY CANT KEEP AN EYE ON HER AT ALL TIMES(which i dont want to do anyway( as I have been through that before in my life and It really made me miserable)with another woman.I also Know that you can be as sincere as you want to but if someone doesn,t want to tell you the truth they wont and all people say they are telling the truth.Now it seems as though i either have to trust her or trust myself.I cant prove anything and apparently she knows this .this is going to be painfull either way asif i refuse to see her unless she tells me the truth I wont have her and if she is telling me the truth (which in my heart I dont think she is)then I may be losing someone who is good for me.I am not going to wait very much longer as i cant stand this I am so afraid of being lonely again and being rejected. I would really appreciate some real input about this. Thanks