Our expert says:
It sounds as if your boyfriend wants to have two relationships, and you have to decide whether this is okay with you or not.
How old is his other girlfriend? I am afraid it may be the case that he has an older girlfriend elsewhere, and you are basically boosting the ego of a 34 year old man by him having a teenage girlfriend. At his age he really should know better and grow up.
If you do not want to share him - then you need to tell him. Then you will know where you stand. You should also ensure you always use a condom if you are having sex with this man. How many partners does he really have!? Someone who has multiple partners puts themselves and their partners at increased risk of STI's and HIV.
My honest advice - find someone who wants you exclusively - if this guy does not I suggest you move on even if this will initially be painful.
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