I’m 56M severely heartbroken by my Reddit girlfriend 38F

Heartbroken (M56) over a female (F38) that I meet on here late last year. Hit it off and we communicated daily and almost hourly. We got to know about each others lives and I the process felt that I was falling for her, it was a long distance relationship but that didn’t matter as we were getting know each other intimately. Made plans to meet in the spring in San Antonio. From one day to another the communication slowed down, I backed off to give her space and then completely stopped. Missing her dearly I reach back to her to tell her that I’ve missed her and wanted to support her. Things were heading back to where we were, excited about our reconciliation I told her that I would be going by to see her the following month. That night the dreadful I need to tell you something, I’m seeing someone, heart drop and broken. As I find out that they had been talking all long. Recently she’s reached out to me and tells me that she’s no longer talking to him however don’t completely believe her… any suggestions or thoughts? Completely lost and heartbroken again….