I've been in a committed relationship for 3.5 years with this woman. She wanted me to propose so this past spring I mustered up the courage and a fair chunk of cash to buy her a ring. Things had maybe gotten a little stale between us but it wasn't bad. We still kissed. We talked extensively every day. We still had sex every now and then. We still said we loved each other.

Then on Saturday she went on a date with a guy and spent the night in his hotel room. She said she only kissed him which I do believe and she was very apologetic at first and so I told her we could work through it and she agreed. Now she seems a lot less keen about working through it though.

I'm a wreck. I love this woman. I'd do just about anything for her. I wanted to get married and have kids with her. She said she wanted these things too but now she doesn't know. What do I do?

Edit: I'm going to give her until the end of today to agree to couples therapy and if she won't then we're done. Thanks everyone. I guess I'll try and figure out how to build my life back.