Want to prevent action beyond the limit of the people in the pool

I just want a normal relationship, but with a woman's sensitivity, I feel that she wants to go even further.

I have just registered to swim for 3 months, swimming in the morning. I knew someone older than him, at first he just asked for the number to contact normally. I know that person works at a media agency so I asked to buy a child locator watch. I asked to buy but that person insisted on giving me a gift, and after that I was stressed to receive the money. The story did not stop there, the person also texted, said that when I didn't go to swim, I remembered, and sometimes praised me for a nice swimming (I can swim, swim faster than him, but the strength is not equal to him).

In the morning, I and I both swim for about 30-35 minutes, go to the jacuzzi for about 10 minutes and then return. It doesn't matter if you don't take my hand and hold my hand, I have to shake. Then yesterday he waved his leg, seemingly wanting to touch my leg. I managed to get out and leave earlier than expected time. He has a family, the oldest child to work. I don't like that kind of relationship. How do people help me to behave skillfully so as not to offend that person and keep my friendships? To add a little more, during the day I just enlist to go to practice in the morning, then go back to send my children to school, pick them up, cook and let them study at night. Sincere thanks.

Hai