My friend gave her ex a hand job a few months after they broke up? what do i say to her?

My best friend and this guy have just turned 16 and they dated for 3 months last year. They had a sexual relationship but the guy broke up with her because he got bored. he has had loads of girlfriends who he also had a sexual relationship with and they all lasted about 3 months as well. my best friend also found... show more My best friend and this guy have just turned 16 and they dated for 3 months last year. They had a sexual relationship but the guy broke up with her because he got bored. he has had loads of girlfriends who he also had a sexual relationship with and they all lasted about 3 months as well. my best friend also found out that he was bi sexual and even maybe just gay but the continued to date him. when they broke up he acted very weird around her and wouldn't talk to her or see her for months after. now a few weeks ago they went out with some other friends and after she went to his house where they started kissing and she gave him a hand job (he was going to finger her but she was on her period) she only just told me and i don't know what to say to her? please help. she also said that it could happen again which i don't think is a good idea because he is just using her and she says that she did it because she missed him but i think its because she misses having a bf in general and doing sexual thing.
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