What to do next?

I dated for over two years one time last year after a great loss of his he claimed he needed time to figure him out, he then came back within a month however I found out at the time he tried to talk to his ex from before me.

Claimed I made him a better person and we could work this out. Same time this year round two needs time to figure him out we had plans for future we were taking so I thought maybe it scared him.

Come to find out today, his ex contacted me again...
I don't know what's going on but we have obligations together. What do I do?
What to do next?
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