I think the reality of this situation is that if you choose a boyfriend who has a child in his life by a former parter, that child will be part of your relationship for the rest of your life together, and there will be many occasions where that child's need takes priority as he is growing up. If you are jealous of that fact and can't deal emotionally with it, you are setting your relationship up to fail because sooner or later he might feel forced to choose between you because of the emotional blackmail to which he feels he's being submitted. It may be hard but you have to learn to deal with this, possibly by developing some interests of your own in which you can participate while your boyfriend is seeing his son. You could try offering to accompany him, although he may want some private time with his son. Yes, he probably will have a lovely day with his son who he must miss, and if his day is spoiled by by coming home to a sulking girlfriend. he may decide your relationship has no future. If you can bring yourself to accept his son as part of your life going forward your boyfriend may feel more willing to include you in the picture and the outings. It must be hard to know that you are not always his No 1 priority, but with so many broken marriages around, there must be many more people who are wrestling with this difficult of divided loyalties. The ones who succeed are those who are able to compromise and learn to turn the situation to their advantage, or at least learn to live with it.