How to tell if he likes me?

About a 3 years ago me and my boyfriend dated. Wr ended up breaking up and now we are talking again. We always end up back in each other’s lives again at least once a year and usually it ends up terrible we talk for like a month. This time we have been snapping for about 3 months, and we even hung out. We have been going to the gym together and hanging out. But he is very hot and cold sometimes he’s dry and other times he’s super interested. He also tries to make me jealous all the time by talking about other women to me. Does it seem like he still could be interested in me or is just messing around?
How to tell if he likes me?
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